Adrian Álvarez Fernández

The High Altitude Water Cherenkov (HAWC) observatory is an array of large water Cherenkov detectors sensitive to gamma rays and hadronic cosmic rays in the energy band between 100 GeV and 100 TeV. The observatory will be used to measure high-energy protons and cosmic rays via detection of the energetic secondary particles reaching the ground when one of these particles interacts in the atmosphere above the detector. HAWC is under construction at a site 4100 meters above sea level on the northern slope of the volcano Sierra Negra, which is located in central Mexico at 19 degrees N latitude. It is scheduled for completion in 2014. In this paper we estimate the sensitivity of the HAWC instrument to point-like and extended sources of gamma rays. The source fluxes are modeled using both unbroken power laws and power laws with exponential cutoffs. HAWC, in one year, is sensitive to point sources with integral power-law spectra as low as 5x10^-13 cm^-2 sec^-1 above 2 TeV (approximately 50 mCrab) over 5 sr of the sky. This is a conservative estimate based on simple event parameters and is expected to improve as the data analysis techniques are refined. We discuss known TeV sources and the scientific contributions that HAWC can make to our understanding of particle acceleration in these sources.

Abstract The luminosity determination for the ATLAS detector at the LHC during Run 2 is presented, with pp collisions at a centre-of-mass energy $$\sqrt{s}=13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV. The absolute luminosity scale is determined using van der Meer beam separation scans during dedicated running periods in each year, and extrapolated to the physics data-taking regime using complementary measurements from several luminosity-sensitive detectors. The total uncertainties in the integrated luminosity for each individual year of data-taking range from 0.9% to 1.1%, and are partially correlated between years. After standard data-quality selections, the full Run 2 pp data sample corresponds to an integrated luminosity of $$140.1\pm 1.2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>140.1</mml:mn> <mml:mo>±</mml:mo> <mml:mn>1.2</mml:mn> </mml:mrow> </mml:math> $$\hbox {fb}^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> , i.e. an uncertainty of 0.83%. A dedicated sample of low-pileup data recorded in 2017–2018 for precision Standard Model physics measurements is analysed separately, and has an integrated luminosity of $$338.1\pm 3.1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>338.1</mml:mn> <mml:mo>±</mml:mo> <mml:mn>3.1</mml:mn> </mml:mrow> </mml:math> $$\hbox {pb}^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mtext>pb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> .

The first evidence for the Higgs boson decay to a Z boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision datasets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around 140 fb^{-1} for each experiment, at a center-of-mass energy of 13 TeV. The measured signal yield is 2.2±0.7 times the standard model prediction, and agrees with the theoretical expectation within 1.9 standard deviations.

Searches for new resonances are performed using an unsupervised anomaly-detection technique. Events with at least one electron or muon are selected from 140 fb−1 of pp collisions at s=13 TeV recorded by ATLAS at the Large Hadron Collider. The approach involves training an autoencoder on data, and subsequently defining anomalous regions based on the reconstruction loss of the decoder. Studies focus on nine invariant mass spectra that contain pairs of objects consisting of one light jet or b jet and either one lepton (e,μ), photon, or second light jet or b jet in the anomalous regions. No significant deviations from the background hypotheses are observed. Limits on contributions from generic Gaussian signals with various widths of the resonance mass are obtained for nine invariant masses in the anomalous regions.Received 10 July 2023Accepted 13 December 2023DOI:https://doi.org/10.1103/PhysRevLett.132.081801Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.© 2024 CERN, for the ATLAS CollaborationPhysics Subject Headings (PhySH)Physical SystemsHypothetical particlesTechniquesHadron collidersMachine learningParticle data analysisParticles & Fields

This letter reports the observation of W(ℓν)γγ production in proton-proton collisions. This measurement uses the full Run 2 sample of events recorded at a center-of-mass energy of s=13 TeV by the ATLAS detector at the LHC, corresponding to an integrated luminosity of 140 fb−1. Events with a leptonically-decaying W boson and at least two photons are considered. The background-only hypothesis is rejected with an observed and expected significance of 5.6 standard deviations. The inclusive fiducial production cross section of W(eν)γγ and W(μν)γγ events is measured to be σfid=13.8±1.1(stat)+2.1−2.0(syst)±0.1(lumi) fb, in agreement with the Standard Model prediction.

This Letter reports the observation of WZγ production and a measurement of its cross section using 140.1±1.2 fb^{-1} of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The WZγ production cross section, with both the W and Z bosons decaying leptonically, pp→WZγ→ℓ^{'}^{±}νℓ^{+}ℓ^{-}γ (ℓ^{(^{'})}=e, μ), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross section is found to be 2.01±0.30(stat)±0.16(syst) fb. The corresponding standard model predicted cross section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50±0.06 fb. The observed significance of the WZγ signal is 6.3σ, compared with an expected significance of 5.0σ.

This paper presents direct searches for lepton flavour violation in Higgs boson decays, $H\rightarrow e\tau$ and $H\rightarrow\mu\tau$, performed using data collected with the ATLAS detector at the LHC. The searches are based on a data sample of proton-proton collisions at a centre-of-mass energy $\sqrt{s} = 13$ TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. Leptonic ($\tau \rightarrow \ell \nu_\ell \nu_\tau$) and hadronic ($\tau \rightarrow $ hadrons $ \nu_\tau$) decays of the $\tau$-lepton are considered. Two background estimation techniques are employed: the MC-template method, based on data-corrected simulation samples, and the Symmetry method, based on exploiting the symmetry between electrons and muons in the Standard Model backgrounds. No significant excess of events is observed and the results are interpreted as upper limits on lepton-flavour-violating branching ratios of the Higgs boson. The observed (expected) upper limits set on the branching ratios at 95% confidence level, $\mathcal{B}(H\rightarrow e\tau)<0.20\%$ (0.12%) and $\mathcal{B}(H\rightarrow \mu\tau)<0.18\%$ (0.09%), are obtained with the MC-template method from a simultaneous measurement of potential $H \rightarrow e\tau$ and $H \rightarrow\mu\tau$ signals. The best-fit branching ratio difference, $\mathcal{B}(H\rightarrow \mu\tau)- \mathcal{B}(H\rightarrow e\tau)$, measured with the Symmetry method in the channel where the $\tau$-lepton decays to leptons, is (0.25 $\pm$ 0.10)%, compatible with a value of zero within 2.5$\sigma$.

Abstract This paper presents the muon momentum calibration and performance studies for the ATLAS detector based on the pp collisions data sample produced at $$\sqrt{s}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV at the LHC during Run 2 and corresponding to an integrated luminosity of 139 $${\textrm{fb}}^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mtext>fb</mml:mtext> </mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> . An innovative approach is used to correct for potential charge-dependent momentum biases related to the knowledge of the detector geometry, using the $$Z\rightarrow \mu ^{+}\mu ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Z</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> resonance. The muon momentum scale and resolution are measured using samples of $$J/\psi \rightarrow \mu ^{+}\mu ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> and $$Z\rightarrow \mu ^{+}\mu ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Z</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> events. A calibration procedure is defined and applied to simulated data to match the performance measured in real data. The calibration is validated using an independent sample of $$\Upsilon \rightarrow \mu ^{+}\mu ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Υ</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> events. At the Z $$(J/\psi )$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> peak, the momentum scale is measured with an uncertainty at the 0.05% (0.1%) level, and the resolution is measured with an uncertainty at the 1.5% (2%) level. The charge-dependent bias is removed with a dedicated in situ correction for momenta up to 450 GeV with a precision better than 0.03 $${\textrm{TeV}}^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mtext>TeV</mml:mtext> </mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> .

A search for nonresonant Higgs boson pair production in the $b\overline{b}b\overline{b}$ final state is presented. The analysis uses $126\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $pp$ collision data at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ collected with the ATLAS detector at the Large Hadron Collider, and targets both the gluon-gluon fusion and vector-boson fusion production modes. No evidence of the signal is found and the observed (expected) upper limit on the cross section for nonresonant Higgs boson pair production is determined to be 5.4 (8.1) times the Standard Model predicted cross section at 95% confidence level. Constraints are placed on modifiers to the $HHH$ and $HHVV$ couplings. The observed (expected) $2\ensuremath{\sigma}$ constraints on the $HHH$ coupling modifier, ${\ensuremath{\kappa}}_{\ensuremath{\lambda}}$, are determined to be $[\ensuremath{-}3.5,11.3]$ ($[\ensuremath{-}5.4,11.4]$), while the corresponding constraints for the $HHVV$ coupling modifier, ${\ensuremath{\kappa}}_{2V}$, are $[\ensuremath{-}0.0,2.1]$ ($[\ensuremath{-}0.1,2.1]$). In addition, constraints on relevant coefficients are derived in the context of the Standard Model effective field theory and Higgs effective field theory, and upper limits on the $HH$ production cross section are placed in seven Higgs effective field theory benchmark scenarios.

The Compact Muon Solenoid (CMS) experiment prepares its Phase-2 upgrade for the high-luminosity era of the LHC operation (HL-LHC). Due to the increase of occupancy, trigger latency and rates, the full electronics of the CMS Drift Tube (DT) chambers will need to be replaced. In the new design, the time bin for the digitization of the chamber signals will be of around 1 ns, and the totality of the signals will be forwarded asynchronously to the service cavern at full resolution. The new backend system will be in charge of building the trigger primitives of each chamber. These trigger primitives contain the information at chamber level about the muon candidates position, direction, and collision time, and are used as input in the L1 CMS trigger. The added functionalities will improve the robustness of the system against ageing. An algorithm based on analytical solutions for reconstructing the DT trigger primitives, called Analytical Method, has been implemented both as a software C++ emulator and in firmware. Its performance has been estimated using the software emulator with simulated and real data samples, and through hardware implementation tests. Measured efficiencies are 96 to 98% for all qualities and time and spatial resolutions are close to the ultimate performance of the DT chambers. A prototype chain of the HL-LHC electronics using the Analytical Method for trigger primitive generation has been installed during Long Shutdown 2 of the LHC and operated in CMS cosmic data taking campaigns in 2020 and 2021. Results from this validation step, the so-called Slice Test, are presented.

Measurements of differential cross sections are presented for inclusive isolated-photon production in $pp$ collisions at a centre-of-mass energy of 13 TeV provided by the LHC and using 139 fb$^{-1}$ of data recorded by the ATLAS experiment. The cross sections are measured as functions of the photon transverse energy in different regions of photon pseudorapidity. The photons are required to be isolated by means of a fixed-cone method with two different cone radii. The dependence of the inclusive-photon production on the photon isolation is investigated by measuring the fiducial cross sections as functions of the isolation-cone radius and the ratios of the differential cross sections with different radii in different regions of photon pseudorapidity. The results presented in this paper constitute an improvement with respect to those published by ATLAS earlier: the measurements are provided for different isolation radii and with a more granular segmentation in photon pseudorapidity that can be exploited in improving the determination of the proton parton distribution functions. These improvements provide a more in-depth test of the theoretical predictions. Next-to-leading-order QCD predictions from JETPHOX and SHERPA and next-to-next-to-leading-order QCD predictions from NNLOJET are compared to the measurements, using several parameterisations of the proton parton distribution functions. The measured cross sections are well described by the fixed-order QCD predictions within the experimental and theoretical uncertainties in most of the investigated phase-space region.

Abstract The identification of b -jets, referred to as b -tagging, is an important part of many physics analyses in the ATLAS experiment at the Large Hadron Collider and an accurate calibration of its performance is essential for high-quality physics results. This publication describes the calibration of the light-flavour jet mistagging efficiency in a data sample of proton–proton collision events at $$\sqrt{s}=13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV corresponding to an integrated luminosity of 139 fb $$^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> . The calibration is performed in a sample of Z bosons produced in association with jets. Due to the low mistagging efficiency for light-flavour jets, a method which uses modified versions of the b -tagging algorithms referred to as flip taggers is used in this work. A fit to the jet-flavour-sensitive secondary-vertex mass is performed to extract a scale factor from data, to correct the light-flavour jet mistagging efficiency in Monte Carlo simulations, while simultaneously correcting the b -jet efficiency. With this procedure, uncertainties coming from the modeling of jets from heavy-flavour hadrons are considerably lower than in previous calibrations of the mistagging scale factors, where they were dominant. The scale factors obtained in this calibration are consistent with unity within uncertainties.

Abstract A search for pair-produced scalar or vector leptoquarks decaying into a b -quark and a $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> -lepton is presented using the full LHC Run 2 (2015–2018) data sample of 139 fb $$^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> collected with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of $$\sqrt{s} =13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV. Events in which at least one $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> -lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio $$\mathcal {B}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> </mml:math> into a $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> -lepton and b -quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming $$\mathcal {B}=100$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>B</mml:mi> <mml:mo>=</mml:mo> <mml:mn>100</mml:mn> </mml:mrow> </mml:math> %, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario.

The inclusive top-quark-pair production cross section σtt¯ and its ratio to the Z-boson production cross section have been measured in proton–proton collisions at s=13.6 TeV, using 29 fb−1 of data collected in 2022 with the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge electron-muon pair and b-tagged jets, and assuming Standard Model decays, the top-quark-pair production cross section is measured to be σtt¯=850±3(stat.)±18(syst.)±20(lumi.) pb. The ratio of the tt¯ and the Z-boson production cross sections is also measured, where the Z-boson contribution is determined for inclusive e+e− and μ+μ− events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the tt¯ cross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, Rtt¯/Z=1.145±0.003(stat.)±0.021(syst.)±0.002(lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set.

This letter presents a search for narrow, high-mass resonances in the Zγ final state with the Z boson decaying into a pair of electrons or muons. The s=13 TeV pp collision data were recorded by the ATLAS detector at the CERN Large Hadron Collider and have an integrated luminosity of 140 fb−1. The data are found to be in agreement with the Standard Model background expectation. Upper limits are set on the resonance production cross section times the decay branching ratio into Zγ. For spin-0 resonances produced via gluon–gluon fusion, the observed limits at 95% confidence level vary between 65.5 fb and 0.6 fb, while for spin-2 resonances produced via gluon–gluon fusion (or quark–antiquark initial states) limits vary between 77.4 (76.1) fb and 0.6 (0.5) fb, for the mass range from 220 GeV to 3400 GeV.

Abstract This paper presents the electron and photon energy calibration obtained with the ATLAS detector using 140 fb -1 of LHC proton-proton collision data recorded at √( s ) = 13 TeV between 2015 and 2018. Methods for the measurement of electron and photon energies are outlined, along with the current knowledge of the passive material in front of the ATLAS electromagnetic calorimeter. The energy calibration steps are discussed in detail, with emphasis on the improvements introduced in this paper. The absolute energy scale is set using a large sample of Z -boson decays into electron-positron pairs, and its residual dependence on the electron energy is used for the first time to further constrain systematic uncertainties. The achieved calibration uncertainties are typically 0.05% for electrons from resonant Z -boson decays, 0.4% at E T ∼ 10 GeV, and 0.3% at E T ∼ 1 TeV; for photons at E T ∼ 60 GeV, they are 0.2% on average. This is more than twice as precise as the previous calibration. The new energy calibration is validated using J / ψ → ee and radiative Z-boson decays.

A search for the decay of the Higgs boson to a Z boson and a light, pseudoscalar particle, a, decaying respectively to two leptons and to two photons is reported. The search uses the full LHC Run 2 proton–proton collision data at s=13 TeV, corresponding to 139 fb−1 collected by the ATLAS detector. This is one of the first searches for this specific decay mode of the Higgs boson, and it probes unexplored parameter space in models with axion-like particles (ALPs) and extended scalar sectors. The mass of the a particle is assumed to be in the range 0.1–33 GeV. The data are analysed in two categories: a merged category where the photons from the a decay are reconstructed in the ATLAS calorimeter as a single cluster, and a resolved category in which two separate photons are detected. The main background processes are from Standard Model Z boson production in association with photons or jets. The data are in agreement with the background predictions, and upper limits on the branching ratio of the Higgs boson decay to Za times the branching ratio a→γγ are derived at the 95% confidence level and they range from 0.08% to 2% depending on the mass of the a particle. The results are also interpreted in the context of ALP models.

A bstract A search for a heavy CP-odd Higgs boson, A , decaying into a Z boson and a heavy CP-even Higgs boson, H , is presented. It uses the full LHC Run 2 dataset of pp collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV collected with the ATLAS detector, corresponding to an integrated luminosity of 140 fb − 1 . The search for A → ZH is performed in the $$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> and $$ \nu \overline{\nu}b\overline{b} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>ν</mml:mi> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> final states and surpasses the reach of previous searches in different final states in the region with m H &gt; 350 GeV and m A &gt; 800 GeV. No significant deviation from the Standard Model expectation is found. Upper limits are placed on the production cross-section times the decay branching ratios. Limits with less model dependence are also presented as functions of the reconstructed m ( $$ t\overline{t} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) and m ( $$ b\overline{b} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) distributions in the $$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>ℓ</mml:mi> <mml:mo>−</mml:mo> </mml:msup> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> and $$ \nu \overline{\nu}b\overline{b} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>ν</mml:mi> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models.

ATLAS measured the centrality dependence of the dijet yield using 165 nb^{-1} of p+Pb data collected at sqrt[s_{NN}]=8.16 TeV in 2016. The event centrality, which reflects the p+Pb impact parameter, is characterized by the total transverse energy registered in the Pb-going side of the forward calorimeter. The central-to-peripheral ratio of the scaled dijet yields, R_{CP}, is evaluated, and the results are presented as a function of variables that reflect the kinematics of the initial hard parton scattering process. The R_{CP} shows a scaling with the Bjorken x of the parton originating from the proton, x_{p}, while no such trend is observed as a function of x_{Pb}. This analysis provides unique input to understanding the role of small proton spatial configurations in p+Pb collisions by covering parton momentum fractions from the valence region down to x_{p}∼10^{-3} and x_{Pb}∼4×10^{-4}.

This Letter presents the first study of Higgs boson production in association with a vector boson (V=W or Z) in the fully hadronic qqbb final state using data recorded by the ATLAS detector at the LHC in proton-proton collisions at sqrt[s]=13 TeV and corresponding to an integrated luminosity of 137 fb^{-1}. The vector bosons and Higgs bosons are each reconstructed as large-radius jets and tagged using jet substructure techniques. Dedicated tagging algorithms exploiting b-tagging properties are used to identify jets consistent with Higgs bosons decaying into bb[over ¯]. Dominant backgrounds from multijet production are determined directly from the data, and a likelihood fit to the jet mass distribution of Higgs boson candidates is used to extract the number of signal events. The VH production cross section is measured inclusively and differentially in several ranges of Higgs boson transverse momentum: 250-450, 450-650, and greater than 650 GeV. The inclusive signal yield relative to the standard model expectation is observed to be μ=1.4_{-0.9}^{+1.0} and the corresponding cross section is 3.1±1.3(stat)_{-1.4}^{+1.8}(syst) pb.

A bstract A search is conducted for new phenomena in events with a top quark pair and large missing transverse momentum, where the top quark pair is reconstructed in final states with one isolated electron or muon and multiple jets. The search is performed using the Large Hadron Collider proton-proton collision data sample at a centre-of-mass energy of $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV recorded by the ATLAS detector that corresponds to an integrated luminosity of 140 fb − 1 . An analysis based on neural network classifiers is optimised to search for directly produced pairs of supersymmetric partners of the top quark (stop), and to search for spin-0 mediators, produced in association with a pair of top quarks, that decay into dark-matter particles. In the stop search, the analysis is designed to target models in which the mass difference between the stop and the neutralino from the stop decay is close to the top quark mass. This new search is combined with previously published searches in final states with different lepton multiplicities. No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set. Models with neutralinos with masses up to 570 GeV are excluded, while for small neutralino masses models are excluded for stop masses up to 1230 GeV. Scalar (pseudoscalar) dark matter mediator masses as large as 350 (370) GeV are excluded when the coupling strengths of the mediator to Standard Model and dark-matter particles are both set to one. At lower mediator masses, models with production cross-sections as small as 0.15 (0.16) times the nominal predictions are excluded. Results of this search are also used to set constraints on effective four-fermion contact interactions between top quarks and neutrinos.

You have accessJournal of UrologyHealth Services Research: Value of Care: Cost and Outcomes I (PD08)1 May 2024PD08-06 STATEWIDE HEALTHCARE UTILIZATION BY SPINA BIFIDA PATIENTS WITH UROLITHIASIS IN CALIFORNIA Nathan VanderVeer-Harris, Yi Li, Debbie Goldberg, Adrian Fernandez, Elaine Allen, Rory Grant, Lindsay Hampson, and Hillary Copp Nathan VanderVeer-HarrisNathan VanderVeer-Harris , Yi LiYi Li , Debbie GoldbergDebbie Goldberg , Adrian FernandezAdrian Fernandez , Elaine AllenElaine Allen , Rory GrantRory Grant , Lindsay HampsonLindsay Hampson , and Hillary CoppHillary Copp View All Author Informationhttps://doi.org/10.1097/01.JU.0001008576.33217.96.06AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Spina bifida (SB) patients are at higher risk of urinary stone disease due to treatment related sequalae like bladder augmentation and innate physiological changes of urinary-neurological dysfunction. We propose that SB patients with concurrent stone disease are at an increased risk of significant healthcare utilization. We aimed to capture the impact of these compounding factors on inpatient encounters using a large, statewide database. METHODS: We performed a secondary analysis of California's Department of Health Care Access and Information (HCAI) database, which captures all patients in the state who are admitted to the hospital, from 2005 to 2017. We compared healthcare utilization across three groups: SB patients with urolithiasis (SB-Stone), SB patients without urolithiasis (SB-Control), and urolithiasis patients without SB (Stone-Control). The primary outcome was the mean number of inpatient encounters per patient. Secondary outcomes included the mean length of stay (LOS) per inpatient hospital encounter and the mean cumulative cost per inpatient hospital encounter. Chi-Squared, Students t-test and ANOVA were employed. A p-value of 0.01 determined statistical significance. RESULTS: There were 1,876 SB-Stone, 18,419 SB-Control, and 1,034,681 Stone-Control patients included (Table 1). The mean number of inpatient encounters was 9.9 (± 15.0) for SB-Stone, 4.9 (± 7.7) for SB-Control, and 4.2 (± 6.7) for Stone-Control (p<0.01). The SB-Stone patients had the greatest mean cumulative cost among all inpatient encounters at $702K (± $1.2M) per patient, followed by SB-Control at $331K (± $729K) and Stone-Control at $253K (± $618K) (p<0.01). The mean cost per inpatient stone-specific diagnosis encounter was $74K (± $119K) for SB-Stone and $56K (± $156K) for Stone-Control (p<0.01). The mean LOS for stone-specific encounters was 7.9 days (± 44.8) for SB-Stone and 5.1 days (± 28.3) for Stone-Control (p=0.03). CONCLUSIONS: We found that SB-Stone patients have a significantly larger number of inpatient encounters in the healthcare system, which are lengthier and more costly. These findings show that urolithiasis increases healthcare utilization in an already high-utilization group, and efforts to implement preventative care to address stone disease by healthcare providers and payers are important. Source of Funding: None © 2024 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 211Issue 5SMay 2024Page: e175 Advertisement Copyright & Permissions© 2024 by American Urological Association Education and Research, Inc.Metrics Author Information Nathan VanderVeer-Harris More articles by this author Yi Li More articles by this author Debbie Goldberg More articles by this author Adrian Fernandez More articles by this author Elaine Allen More articles by this author Rory Grant More articles by this author Lindsay Hampson More articles by this author Hillary Copp More articles by this author Expand All Advertisement PDF downloadLoading ...

A bstract A combination of searches for new heavy spin-1 resonances decaying into different pairings of W , Z , or Higgs bosons, as well as directly into leptons or quarks, is presented. The data sample used corresponds to 139 fb − 1 of proton-proton collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV collected during 2015–2018 with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting quark pairs ( qq , bb , $$ t\overline{t} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> , and tb ) or third-generation leptons ( τν and ττ ) are included in this kind of combination for the first time. A simplified model predicting a spin-1 heavy vector-boson triplet is used. Cross-section limits are set at the 95% confidence level and are compared with predictions for the benchmark model. These limits are also expressed in terms of constraints on couplings of the heavy vector-boson triplet to quarks, leptons, and the Higgs boson. The complementarity of the various analyses increases the sensitivity to new physics, and the resulting constraints are stronger than those from any individual analysis considered. The data exclude a heavy vector-boson triplet with mass below 5.8 TeV in a weakly coupled scenario, below 4.4 TeV in a strongly coupled scenario, and up to 1.5 TeV in the case of production via vector-boson fusion.

A bstract A search for R-parity-violating supersymmetry in final states with high jet multiplicity is presented. The search uses 140 fb − 1 of proton-proton collision data at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV collected by the ATLAS experiment during Run 2 of the Large Hadron Collider. The results are interpreted in the context of R-parity-violating supersymmetry models that feature prompt gluino-pair production decaying directly to three jets each or decaying to two jets and a neutralino which subsequently decays promptly to three jets. No significant excess over the Standard Model expectation is observed and exclusion limits at the 95% confidence level are extracted. Gluinos with masses up to 1800 GeV are excluded when decaying directly to three jets. In the cascade scenario, gluinos with masses up to 2340 GeV are excluded for a neutralino with mass up to 1250 GeV.

VAMOS was a prototype detector built in 2011 at an altitude of 4100m a.s.l. in the state of Puebla, Mexico. The aim of VAMOS was to finalize the design, construction techniques and data acquisition system of the HAWC observatory. HAWC is an air-shower array currently under construction at the same site of VAMOS with the purpose to study the TeV sky. The VAMOS setup included six water Cherenkov detectors and two different data acquisition systems. It was in operation between October 2011 and May 2012 with an average live time of 30%. Besides the scientific verification purposes, the eight months of data were used to obtain the results presented in this paper: the detector response to the Forbush decrease of March 2012, and the analysis of possible emission, at energies above 30 GeV, for long gamma-ray bursts GRB111016B and GRB120328B.

A virtual point-of-care ultrasound (POCUS) education program was initiated to introduce handheld ultrasound technology to Georgetown Public Hospital Corporation in Guyana, a low-resource setting. We studied ultrasound competency and participant satisfaction in a cohort of 20 physicians-in-training through the urology clinic. The program consisted of a training phase, where they learned how to use the Butterfly iQ ultrasound, and a mentored implementation phase, where they applied their skills in the clinic. The assessment was through written exams and an objective structured clinical exam (OSCE). Fourteen students completed the program. The written exam scores were 3.36/5 in the training phase and 3.57/5 in the mentored implementation phase, and all students earned 100% on the OSCE. Students expressed satisfaction with the program. Our POCUS education program demonstrates the potential to teach clinical skills in low-resource settings and the value of virtual global health partnerships in advancing POCUS and minimally invasive diagnostics.

The NimbleAI Horizon Europe project leverages key principles of energy-efficient visual sensing and processing in biological eyes and brains, and harnesses the latest advances in <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{33D}$</tex> stacked silicon integration, to create an integral sensing-processing neuromorphic architecture that efficiently and accurately runs computer vision algorithms in area-constrained endpoint chips. The rationale behind the NimbleAI architecture is: sense data only with high information value and discard data as soon as they are found not to be useful for the application (in a given context). The NimbleAI sensing-processing architecture is to be specialized after-deployment by tunning system-level trade-offs for each particular computer vision algorithm and deployment environment. The objectives of NimbleAI are: (1) <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{100x}$</tex> performance per mW gains compared to state-of-the-practice solutions (i.e., CPU/GPUs processing frame-based video); (2) <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{50x}$</tex> processing latency reduction compared to CPU/GPUs; (3) energy consumption in the order of tens of mWs; and (4) silicon area of approx. 50 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .

A bstract A search for the leptonic charge asymmetry ( $$ {A}_{\textrm{c}}^{\ell } $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>A</mml:mi> <mml:mi>c</mml:mi> <mml:mi>ℓ</mml:mi> </mml:msubsup> </mml:math> ) of top-quark-antiquark pair production in association with a W boson ( $$ t\overline{t}W $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mi>W</mml:mi> </mml:math> ) is presented. The search is performed using final states with exactly three charged light leptons (electrons or muons) and is based on $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN during the years 2015–2018, corresponding to an integrated luminosity of 139 fb − 1 . A profile-likelihood fit to the event yields in multiple regions corresponding to positive and negative differences between the pseudorapidities of the charged leptons from top-quark and top-antiquark decays is used to extract the charge asymmetry. At reconstruction level, the asymmetry is found to be −0 . 12 ± 0 . 14 (stat.) ± 0 . 05 (syst.). An unfolding procedure is applied to convert the result at reconstruction level into a charge-asymmetry value in a fiducial volume at particle level with the result of −0 . 11 ± 0 . 17 (stat.) ± 0 . 05 (syst.). The Standard Model expectations for these two observables are calculated using Monte Carlo simulations with next-to-leading-order plus parton shower precision in quantum chromodynamics and including next-to-leading-order electroweak corrections. They are $$ -{0.084}_{-0.003}^{+0.005} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>−</mml:mo> <mml:msubsup> <mml:mn>0.084</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.003</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.005</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> (scale) ± 0 . 006 (MC stat.) and $$ -{0.063}_{-0.004}^{+0.007} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>−</mml:mo> <mml:msubsup> <mml:mn>0.063</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.004</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.007</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> (scale) ± 0 . 004 (MC stat.) respectively, and in agreement with the measurements.

Measurements of transverse energy$-$energy correlations and their associated azimuthal asymmetries in multijet events are presented. The analysis is performed using a data sample corresponding to 139 $\mbox{fb\(^{-1}\)}$ of proton$-$proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV, collected with the ATLAS detector at the Large Hadron Collider. The measurements are presented in bins of the scalar sum of the transverse momenta of the two leading jets and unfolded to particle level. They are then compared to next-to-next-to-leading-order perturbative QCD calculations for the first time, which feature a significant reduction in the theoretical uncertainties estimated using variations of the renormalisation and factorisation scales. The agreement between data and theory is good, thus providing a precision test of QCD at large momentum transfers $Q$. The strong coupling constant $\alpha_s$ is extracted differentially as a function of $Q$, showing a good agreement with the renormalisation group equation and with previous analyses. A simultaneous fit to all transverse energy$-$energy correlation distributions across different kinematic regions yields a value of $\alpha_\mathrm{s}(m_Z) = 0.1175 \pm 0.0006 \mbox{ (exp.)} ^{+0.0034}_{-0.0017} \mbox{ (theo.)}$, while the global fit to the asymmetry distributions yields $\alpha_{\mathrm{s}}(m_Z) = 0.1185 \pm 0.0009 \mbox{ (exp.)} ^{+0.0025}_{-0.0012} \mbox{ (theo.)}$.

A bstract This paper describes a search for dark photons ( γ d ) in proton-proton collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV at the Large Hadron Collider (LHC). The dark photons are searched for in the decay of Higgs bosons ( H → γγ d ) produced through the ZH production mode. The transverse mass of the system, made of the photon and the missing transverse momentum from the non-interacting γ d , presents a distinctive signature as it peaks near the Higgs boson mass. The results presented use the total Run-2 integrated luminosity of 139 fb − 1 recorded by the ATLAS detector at the LHC. The dominant reducible background processes are estimated using data-driven techniques. A Boosted Decision Tree technique is adopted to enhance the sensitivity of the search. As no excess is observed with respect to the Standard Model prediction, an observed (expected) upper limit on the branching ratio BR( H → γγ d ) of 2.28% ( $$ {2.82}_{-0.84}^{+1.33}\% $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>2.82</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.84</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>1.33</mml:mn> </mml:mrow> </mml:msubsup> <mml:mo>%</mml:mo> </mml:math> ) is set at 95% CL for massless γ d . For massive dark photons up to 40 GeV, the observed (expected) upper limits on BR( H → γγ d ) at 95% confidence level is found within the [2.19,2.52]% ([2.71,3.11]%) range.

The production of a $W$ boson in association with a single charm quark is studied using $140\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by the presence of a charmed hadron reconstructed with a secondary-vertex fit. The $W$ boson is reconstructed from the decay to either an electron or a muon and the missing transverse momentum present in the event. The charmed mesons reconstructed are ${D}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ and ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}({K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}){\ensuremath{\pi}}^{+}$ and the charge conjugate decays in the fiducial regions where ${p}_{\mathrm{T}}(e,\ensuremath{\mu})&gt;30\text{ }\text{ }\mathrm{GeV}$, $|\ensuremath{\eta}(e,\ensuremath{\mu})|&lt;2.5$, ${p}_{\mathrm{T}}({D}^{(*)})&gt;8\text{ }\text{ }\mathrm{GeV}$, and $|\ensuremath{\eta}({D}^{(*)})|&lt;2.2$. The integrated and normalized differential cross sections as a function of the pseudorapidity of the lepton from the $W$ boson decay, and of the transverse momentum of the charmed hadron, are extracted from the data using a profile likelihood fit. The measured total fiducial cross sections are ${\ensuremath{\sigma}}_{\mathrm{fid}}^{\mathrm{OS}--\mathrm{SS}}({W}^{\ensuremath{-}}+{D}^{+})=50.2\ifmmode\pm\else\textpm\fi{}0.2{(\mathrm{stat})}_{\ensuremath{-}2.3}^{+2.4}(\mathrm{syst})\text{ }\text{ }\mathrm{pb}$, ${\ensuremath{\sigma}}_{\mathrm{fid}}^{\mathrm{OS}--\mathrm{SS}}({W}^{+}+{D}^{\ensuremath{-}})=48.5\ifmmode\pm\else\textpm\fi{}0.2{(\mathrm{stat})}_{\ensuremath{-}2.2}^{+2.3}(\mathrm{syst})\text{ }\text{ }\mathrm{pb}$, ${\ensuremath{\sigma}}_{\mathrm{fid}}^{\mathrm{OS}--\mathrm{SS}}({W}^{\ensuremath{-}}+{D}^{*+})=51.1\ifmmode\pm\else\textpm\fi{}0.4{(\mathrm{stat})}_{\ensuremath{-}1.8}^{+1.9}(\mathrm{syst})\text{ }\text{ }\mathrm{pb}$, and ${\ensuremath{\sigma}}_{\mathrm{fid}}^{\mathrm{OS}--\mathrm{SS}}({W}^{+}+{D}^{*\ensuremath{-}})=50.0\ifmmode\pm\else\textpm\fi{}0.4{(\mathrm{stat})}_{\ensuremath{-}1.8}^{+1.9}(\mathrm{syst})\text{ }\text{ }\mathrm{pb}$. Results are compared with the predictions of next-to-leading-order quantum chromodynamics calculations performed using state-of-the-art parton distribution functions. Additionally, the ratio of charm to anticharm production cross sections is studied to probe the $s\text{\ensuremath{-}}\overline{s}$ quark asymmetry. The ratio is found to be ${R}_{c}^{\ifmmode\pm\else\textpm\fi{}}=0.971\ifmmode\pm\else\textpm\fi{}0.006(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.011(\mathrm{syst})$. The ratio and cross-section measurements are consistent with the predictions obtained with parton distribution function sets that have a symmetric $s\text{\ensuremath{-}}\overline{s}$ sea, indicating that any $s\text{\ensuremath{-}}\overline{s}$ asymmetry in the Bjorken-$x$ region relevant for this measurement is small.

A bstract A search for leptoquarks decaying into the bτ final state is performed using Run 2 proton-proton collision data from the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb − 1 at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV recorded by the ATLAS detector. The benchmark models considered in this search are vector leptoquarks with electric charge of 2/3e and scalar leptoquarks with an electric charge of 4/3e. No significant excess above the Standard Model prediction is observed, and 95% confidence level upper limits are set on the cross-section times branching fraction of leptoquarks decaying into bτ . For the vector leptoquark production two models are considered: the Yang-Mills and Minimal coupling models. In the Yang-Mills (Minimal coupling) scenario, vector leptoquarks with a mass below 1.58 (1.35) TeV are excluded for a gauge coupling of 1.0 and below 2.05 (1.99) TeV for a gauge coupling of 2.5. In the case of scalar leptoquarks, masses below 1.28 (1.53) TeV are excluded for a Yukawa coupling of 1.0 (2.5). Finally, an interpretation of the results with minimal model dependence is performed for each of the signal region categories, and limits on the visible cross-section for beyond the Standard Model processes are provided.

The vector-boson production cross section for the Higgs boson decay in the $H\ensuremath{\rightarrow}W{W}^{*}\ensuremath{\rightarrow}e\ensuremath{\nu}\ensuremath{\mu}\ensuremath{\nu}$ channel is measured as a function of kinematic observables sensitive to the Higgs boson production and decay properties as well as integrated in a fiducial phase space. The analysis is performed using the proton-proton collision data collected by the ATLAS detector in Run 2 of the LHC at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ center-of-mass energy, corresponding to an integrated luminosity of $139\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The different flavor final state is studied by selecting an electron and a muon originating from a pair of $W$ bosons and compatible with the Higgs boson decay. The data are corrected for the effects of detector inefficiency and resolution, and the measurements are compared with different state-of-the-art theoretical predictions. The differential cross sections are used to constrain anomalous interactions described by dimension-six operators in an effective field theory.

The mass of the Higgs boson is measured in the H→γγ decay channel, exploiting the high resolution of the invariant mass of photon pairs reconstructed from the decays of Higgs bosons produced in proton–proton collisions at a centre-of-mass energy s=13 TeV. The dataset was collected between 2015 and 2018 by the ATLAS detector at the Large Hadron Collider, and corresponds to an integrated luminosity of 140 fb−1. The measured value of the Higgs boson mass is 125.17±0.11(stat.)±0.09(syst.) GeV and is based on an improved energy scale calibration for photons, whose impact on the measurement is about four times smaller than in the previous publication. A combination with the corresponding measurement using 7 and 8 TeV pp collision ATLAS data results in a Higgs boson mass measurement of 125.22±0.11(stat.)±0.09(syst.) GeV. With an uncertainty of 1.1 per mille, this is currently the most precise measurement of the mass of the Higgs boson from a single decay channel.

A bstract A study of the polarisation and CP properties in ZZ production is presented. The used data set corresponds to an integrated luminosity of 140 fb − 1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The ZZ candidate events are reconstructed using two same-flavour opposite-charge electron or muon pairs. The production of two longitudinally polarised Z bosons is measured with a significance of 4.3 standard deviations, and its cross-section is measured in a fiducial phase space to be 2.45 ± 0.60 fb, consistent with the next-to-leading-order Standard Model prediction. The inclusive differential cross-section as a function of a CP-sensitive angular observable is also measured. The results are used to constrain anomalous CP-odd neutral triple gauge couplings.

The High-Altitude Water Cherenkov Gamma Ray Observatory (HAWC) is under construction 4100 meters above sea level at Sierra Negra, Mexico. We describe the design and cabling of the detector, the characterization of the photomultipliers, and the timing calibration system. We also outline a next-generation detector based on the water Cherenkov technique.

Pneumatosis cystoides intestinalis (PCI) is an uncommon condition where cyst-like locules of gas are present in the submucosa or subserosa of the gastrointestinal tract. The majority of cases are benign and are associated with drugs such as chemotherapy agents or conditions including chronic obstructive airways disease. We present the case of PCI resulting in pneumoperitoneum in a 72-year-old male patient on chemotherapy for esophageal adenocarcinoma. While he was noted to have an extensive pneumoperitoneum and mesenteric emphysema on imaging, he remained clinically stable with a benign abdominal examination and was managed conservatively with intravenous antibiotics and fluids. This case highlights the importance of benign PCI as a differential to bowel ischemia in patients with pneumatosis intestinalis and pneumoperitoneum, particularly given the possibility of avoiding operative management and the resultant morbidity.

We describe measurements of GeV and TeV cosmic rays with the High-Altitude Water Cherenkov Gamma-Ray Observatory, or HAWC. The measurements include the observation of the shadow of the moon; the observation of small-scale and large-scale angular clustering of the TeV cosmic rays; the prospects for measurement of transient solar events with HAWC; and the observation of Forbush decreases with the HAWC engineering array and HAWC-30.

The CMS drift tubes (DT) muon detector, built for withstanding the LHC expected integrated and instantaneous luminosities, will be used also in the High Luminosity LHC (HL-LHC) at a 5 times larger instantaneous luminosity and, consequently, much higher levels of radiation, reaching about 10 times the LHC integrated luminosity. Initial irradiation tests of a spare DT chamber at the CERN gamma irradiation facility (GIF++), at large (∼ O(100)) acceleration factor, showed ageing effects resulting in a degradation of the DT cell performance. However, full CMS simulations have shown almost no impact in the muon reconstruction efficiency over the full barrel acceptance and for the full integrated luminosity. A second spare DT chamber was moved inside the GIF++ bunker in October 2017. The chamber was being irradiated at lower acceleration factors, and only 2 out of the 12 layers of the chamber were switched at working voltage when the radioactive source was active, being the other layers in standby. In this way the other non-aged layers are used as reference and as a precise and unbiased telescope of muon tracks for the efficiency computation of the aged layers of the chamber, when set at working voltage for measurements. An integrated dose equivalent to two times the expected integrated luminosity of the HL-LHC run has been absorbed by this second spare DT chamber and the final impact on the muon reconstruction efficiency is under study. Direct inspection of some extracted aged anode wires presented a melted resistive deposition of materials. Investigation on the outgassing of cell materials and of the gas components used at the GIF++ are underway. Strategies to mitigate the ageing effects are also being developed. From the long irradiation measurements of the second spare DT chamber, the effects of radiation in the performance of the DTs expected during the HL-LHC run will be presented.

A measurement of the polarisation of W bosons produced in top-quark decays is presented, using proton–proton collision data at a centre-of-mass energy of s=13 TeV. The data were collected by the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 139 fb−1. The measurement is performed selecting tt¯ events decaying into final states with two charged leptons (electrons or muons) and at least two b-tagged jets. The polarisation is extracted from the differential cross-section distribution of the ⁎cos⁡θ⁎ variable, where ⁎θ⁎ is the angle between the momentum direction of the charged lepton from the W boson decay and the reversed momentum direction of the b-quark from the top-quark decay, both calculated in the W boson rest frame. Parton-level results, corrected for the detector acceptance and resolution, are presented for the ⁎cos⁡θ⁎ angle. The measured fractions of longitudinal, left- and right-handed polarisation states are found to be f0=0.684±0.005(stat.)±0.014(syst.), fL=0.318±0.003(stat.)±0.008(syst.) and fR=−0.002±0.002(stat.)±0.014(syst.), in agreement with the Standard Model prediction.

A model-independent search for new physics leading to final states containing $H\rightarrow\gamma\gamma$ decays is performed with 139 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV pp collision data recorded by the ATLAS detector at the Large Hadron Collider at CERN. This search examines 22 final states categorized by the objects that are produced in association with the Higgs boson. These objects include isolated electrons or muons, hadronically decaying $\tau$-leptons, additional photons, missing transverse momentum, and hadronic jets, as well as jets that are tagged as containing a b-hadron. No significant excesses above Standard Model expectations are observed and limits on the production cross section at 95% confidence level are set. Detector efficiencies are reported for all 22 signal regions, which can be used to convert detector-level cross-section limits reported in this paper to particle-level cross-section constraints.

Measurements of the suppression and correlations of dijets is performed using $3\phantom{\rule{4pt}{0ex}}\textmu{}{\mathrm{b}}^{\ensuremath{-}1}$ of Xe+Xe data at $\sqrt{{s}_{NN}}=5.44$ TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Dijets with jets reconstructed using the $R=0.4$ anti-${k}_{t}$ algorithm are measured differentially in jet ${p}_{\text{T}}$ over the range of 32 to 398 GeV and the centrality of the collisions. Significant dijet momentum imbalance is found in the most central Xe+Xe collisions, which decreases in more peripheral collisions. Results from the measurement of per-pair normalized and absolutely normalized dijet ${p}_{\text{T}}$ balance are compared with previous $\mathrm{Pb}+\mathrm{Pb}$ measurements at $\sqrt{{s}_{NN}}=5.02$ TeV. The differences between the dijet suppression in Xe+Xe and $\mathrm{Pb}+\mathrm{Pb}$ are further quantified by the ratio of pair nuclear-modification factors. The results are found to be consistent with those measured in $\mathrm{Pb}+\mathrm{Pb}$ data when compared in classes of the same event activity and when taking into account the difference between the center-of-mass energies of the initial parton scattering process in Xe+Xe and $\mathrm{Pb}+\mathrm{Pb}$ collisions. These results should provide input for a better understanding of the role of energy density, system size, path length, and fluctuations in the parton energy loss.

Abstract Higgs boson production via gluon–gluon fusion is measured in the $$WW^{*} \rightarrow e\nu \mu \nu $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>W</mml:mi> <mml:msup> <mml:mi>W</mml:mi> <mml:mrow> <mml:mrow /> <mml:mo>∗</mml:mo> </mml:mrow> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>e</mml:mi> <mml:mi>ν</mml:mi> <mml:mi>μ</mml:mi> <mml:mi>ν</mml:mi> </mml:mrow> </mml:math> decay channel. The dataset utilized corresponds to an integrated luminosity of 139 fb $$^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> collected by the ATLAS detector from $$\sqrt{s}=13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV proton–proton collisions delivered by the Large Hadron Collider between 2015 and 2018. Differential cross sections are measured in a fiducial phase space restricted to the production of at most one additional jet. The results are consistent with Standard Model expectations, derived using different Monte Carlo generators.

A search for new phenomena giving rise to pairs of opposite electrically charged muons with impact parameters in the millimeter range is presented, using 139 fb−1 of s=13 TeV pp collision data from the ATLAS detector at the LHC. The search targets the gap in coverage between existing searches targeting final states with leptons with large displacement and prompt leptons. No significant excess over the background expectation is observed and exclusion limits are set on the mass of long-lived scalar supersymmetric muon-partners (smuons) with much lower lifetimes than previously targeted by displaced muon searches. Smuon lifetimes down to 1 ps are excluded for a smuon mass of 100 GeV, and smuon masses up to 520 GeV are excluded for a proper lifetime of 10 ps, at 95% confidence level. Finally, model-independent limits are set on the contribution from new phenomena to the signal-region yields.

A bstract This paper reports the first ATLAS measurement of the $$ {B}_s^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> → μμ effective lifetime. The measurement is based on the data collected in 2015–2016, amounting to 26.3 fb − 1 of 13 TeV LHC proton-proton collisions. The proper decay-time distribution of 58 ± 13 background-subtracted signal candidates is fit with simulated signal templates parameterised as a function of the $$ {B}_s^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the $$ {B}_s^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> → μμ lifetime is $$ {0.99}_{-0.07}^{+0.42} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0.99</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.07</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.42</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> (stat.) ± 0 . 17 (syst.) ps and it is found to be consistent with the Standard Model.

This Letter presents the measurement of the fiducial and differential cross-sections of the electroweak production of a Zγ pair in association with two jets. The analysis uses 140 fb−1 of LHC proton–proton collision data taken at s=13 TeV recorded by the ATLAS detector during the years 2015–2018. Events with a Z boson candidate decaying into either an e+e− or μ+μ− pair, a photon and two jets are selected. The electroweak component is extracted by requiring a large dijet invariant mass and by using the information about the centrality of the system and is measured with an observed and expected significance well above five standard deviations. The fiducial pp→Zγjj cross-section for the electroweak production is measured to be 3.6 ± 0.5 fb. The total fiducial cross-section that also includes contributions where the jets arise from strong interactions is measured to be 16.8−1.8+2.0 fb. The results are consistent with the Standard Model predictions. Differential cross-sections are also measured using the same events and are compared with parton-shower Monte Carlo simulations. Good agreement is observed between data and predictions.

A bstract A search for a new heavy scalar particle X decaying into a Standard Model (SM) Higgs boson and a new singlet scalar particle S is presented. The search uses a proton-proton ( pp ) collision data sample with an integrated luminosity of 140 fb − 1 recorded at a centre-of-mass energy of $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV with the ATLAS detector at the Large Hadron Collider. The most sensitive mass parameter space is explored in X mass ranging from 500 to 1500 GeV, with the corresponding S mass in the range 200–500 GeV. The search selects events with two hadronically decaying τ -lepton candidates from H → τ + τ − decays and one or two light leptons ( ℓ = e , μ ) from S → VV ( V = W , Z ) decays while the remaining V boson decays hadronically or to neutrinos. A multivariate discriminant based on event kinematics is used to separate the signal from the background. No excess is observed beyond the expected SM background and 95% confidence level upper limits between 72 fb and 542 fb are derived on the cross-section σ ( pp → X → SH ) assuming the same SM-Higgs boson-like decay branching ratios for the S → VV decay. Upper limits on the visible cross-sections σ ( pp → X → SH → WWττ ) and σ ( pp → X → SH → ZZττ ) are also set in the ranges 3–26 fb and 6–33 fb, respectively.

La estructura y organización en las instituciones educativas constituyen aspectos fundamentales para llevar a cabo coordinativamente la educación, por la unión de los esfuerzos de cada uno de los sectores que la componen para el logro del objetivo común, en ese sentido el objetivo de la investigación fue analizar la estructura y la organización del plantel académico de la Facultad de Humanidades y Ciencias de la Educación de la UNP, la muestra estuvo compuesta por 37 personas de los 45 que conforman el plantel académico. Se aplicó como técnicas de recolección de datos la observación documental y el cuestionario basado en un enfoque cuantitativo, el análisis de los resultados arrojó que la Facultad de Humanidades y Ciencias de la Educación cuenta con una estructura y organización del plantel académico, así también se constató que existen ciertos aspectos a mejorar.

This letter presents a measurement of the nuclear modification factor of large-radius jets in sqrt[s_{NN}]=5.02 TeV Pb+Pb collisions by the ATLAS experiment. The measurement is performed using 1.72 nb^{-1} and 257 pb^{-1} of Pb+Pb and pp data, respectively. The large-radius jets are reconstructed with the anti-k_{t} algorithm using a radius parameter of R=1.0, by reclustering anti-k_{t} R=0.2 jets, and are measured over the transverse momentum (p_{T}) kinematic range of 158<p_{T}<1000 GeV and absolute pseudorapidity |y|<2.0. The large-radius jet constituents are further reclustered using the k_{t} algorithm in order to obtain the splitting parameters, sqrt[d_{12}] and ΔR_{12}, which characterize the transverse momentum scale and angular separation for the hardest splitting in the jet, respectively. The nuclear modification factor, R_{AA}, obtained by comparing the Pb+Pb jet yields to those in pp collisions, is measured as a function of jet transverse momentum (p_{T}) and sqrt[d_{12}] or ΔR_{12}. A significant difference in the quenching of large-radius jets having single subjet and those with more complex substructure is observed. Systematic comparison of jet suppression in terms of R_{AA} for different jet definitions is also provided. Presented results support the hypothesis that jets with hard internal splittings lose more energy through quenching and provide a new perspective for understanding the role of jet structure in jet suppression.

A search for a new pseudoscalar a-boson produced in events with a top-quark pair, where the a-boson decays into a pair of muons, is performed using s=13 TeV pp collision data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 139 fb−1. The search targets the final state where only one top quark decays to an electron or muon, resulting in a signature with three leptons eμμ and μμμ. No significant excess of events above the Standard Model expectation is observed and upper limits are set on two signal models: pp→tt¯a and pp→tt¯ with t→H±b, H±→W±a, where a→μμ, in the mass ranges 15 GeV<ma<72 GeV and 120 GeV≤mH±≤160 GeV.Received 28 April 2023Accepted 18 September 2023DOI:https://doi.org/10.1103/PhysRevD.108.092007Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.© 2023 CERN, for the ATLAS CollaborationPhysics Subject Headings (PhySH)Research AreasExtensions of scalar sectorTop quark productionParticles & Fields

A search for events with a dark photon produced in association with a dark Higgs boson via rare decays of the standard model Z boson is presented, using 139 fb−1 of s=13 TeV proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider. The dark boson decays into a pair of dark photons, and at least two of the three dark photons must each decay into a pair of electrons or muons, resulting in at least two same-flavor opposite-charge lepton pairs in the final state. The data are found to be consistent with the background prediction, and upper limits are set on the dark photon’s coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photon, αDϵ2, in the dark photon mass range of [5, 40] GeV except for the ϒ mass window [8.8, 11.1] GeV. This search explores new parameter space not previously excluded by other experiments.Received 16 June 2023Accepted 11 October 2023DOI:https://doi.org/10.1103/PhysRevLett.131.251801Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.© 2023 CERN, for the ATLAS CollaborationPhysics Subject Headings (PhySH)Research AreasExtensions of gauge sectorPhysical SystemsHypothetical gauge bosonsW & Z bosonsTechniquesHadron collidersParticles & Fields

A measurement of the mass of the Higgs boson combining the H→ZZ*→4ℓ and H→γγ decay channels is presented. The result is based on 140 fb−1 of proton-proton collision data collected by the ATLAS detector during LHC run 2 at a center-of-mass energy of 13 TeV combined with the run 1 ATLAS mass measurement, performed at center-of-mass energies of 7 and 8 TeV, yielding a Higgs boson mass of 125.11±0.09(stat)±0.06(syst)=125.11±0.11 GeV. This corresponds to a 0.09% precision achieved on this fundamental parameter of the Standard Model of particle physics.Received 10 August 2023Accepted 6 November 2023DOI:https://doi.org/10.1103/PhysRevLett.131.251802Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.© 2023 CERN, for the ATLAS CollaborationPhysics Subject Headings (PhySH)Physical SystemsHiggs bosonsPropertiesMassParticles & Fields

A bstract A search for flavour-changing neutral interactions involving the top quark, the Higgs boson and an up-type quark q ( q = c, u ) is presented. The proton-proton collision data set used, with an integrated luminosity of 139 fb − 1 , was collected at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV by the ATLAS experiment at the Large Hadron Collider. Both the decay process t → qH in $$ t\overline{t} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> production and the production process pp → tH , with the Higgs boson decaying into two photons, are investigated. No significant excess is observed and upper limits are set on the t → cH and the t → uH branching ratios of 4 . 3 × 10 − 4 and 3 . 8 × 10 − 4 , respectively, at the 95% confidence level, while the expected limits in the absence of signal are 4 . 7 × 10 − 4 and 3 . 9 × 10 − 4 . Combining this search with ATLAS searches in the H → τ + τ − and H → $$ b\overline{b} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>b</mml:mi> <mml:mover> <mml:mi>b</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> final states yields observed (expected) upper limits on the t → cH branching ratio of 5 . 8 × 10 − 4 (3 . 0 × 10 − 4 ) at the 95% confidence level. The corresponding observed (expected) upper limit on the t → uH branching ratio is 4 . 0 × 10 − 4 (2 . 4 × 10 − 4 ).

The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is designed to record air showers produced by cosmic rays and gamma rays between 100 GeV and 100 TeV. Because of its large field of view and high livetime, HAWC is well-suited to measure gamma rays from extended sources, diffuse emission, and transient sources. We describe the sensitivity of HAWC to emission from the extended Cygnus region as well as other types of galactic diffuse emission; searches for flares from gamma-ray bursts and active galactic nuclei; and the first measurement of the Crab Nebula with HAWC-30.

During the High Luminosity LHC, the Drift Tube chambers installed in the CMS detector need to operate with an integrated dose ten times higher than expected at the LHC due to the increase in integrated luminosity from 300 fb-1 to 3000 fb-1. Irradiations have been performed to assess the performance of the detector under such conditions and to characterize the radiation aging of the detector. The presented analysis focuses on the behaviour of the high voltage currents and the dose measurements needed to extrapolate the results to High Luminosity conditions, using data from the photon irradiation campaign at GIF++ in 2016 as well as the efficiency analysis from the irradiation campaign started in 2017. Although the single-wire loss of high voltage gain observed of 70% is very high, the muon reconstruction efficiency is expected to decrease less than 20% during the full duration of High Luminosity LHC in the areas under highest irradiation.

The High-Altitude Water Cherenkov Gamma Ray Observatory (HAWC) is designed to perform a synoptic survey of the TeV sky. The high energy coverage of the experiment will enable studies of fundamental physics beyond the Standard Model, and the large field of view of the detector will enable detailed studies of cosmologically significant backgrounds and magnetic fields. We describe the sensitivity of the full HAWC array to these phenomena in five contributions shown at the 33rd International Cosmic Ray Conference in Rio de Janeiro, Brazil (July 2013).

You have accessJournal of UrologyCME1 May 2022MP30-13 TRAINING AND IMPLEMENTATION OF HANDHELD ULTRASOUND TECHNOLOGY AT GEORGETOWN PUBLIC HOSPITAL CORPORATION: A LOW-COST INTERVENTION TO IMPROVE DIAGNOSTIC EVALUATION IN A RESOURCE-LIMITED UROLOGY CLINIC Michelle Bui, Adrian Fernandez, Budheshwar Ramsukh, Onika Noel, Chris Prashad, and David Bayne Michelle BuiMichelle Bui More articles by this author , Adrian FernandezAdrian Fernandez More articles by this author , Budheshwar RamsukhBudheshwar Ramsukh More articles by this author , Onika NoelOnika Noel More articles by this author , Chris PrashadChris Prashad More articles by this author , and David BayneDavid Bayne More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000002573.13AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Access to in-clinic radiology is a major health care disparity in low and middle-income countries. At Georgetown Public Hospital Corporation (GPHC) in Guyana, providers must assess urinary retention through catheterization instead of point of care ultrasound (POCUS). Thus, our objectives were to initiate a virtual POCUS training program at GPHC using the Butterfly iQ and to study its efficacy and stakeholder satisfaction. METHODS: This was a prospective cohort study of 20 medical students at GPHC participating in a POCUS training program taught by urologists from the University of California, San Francisco (UCSF) and GPHC. In the 20-day training phase, students learned POCUS basics through online written and video materials then took a written exam. They attended a live Zoom interactive lecture with UCSF and GPHC urologists and practiced using the Butterfly iQ before completing an Objective Structured Clinical Exam (OSCE) and satisfaction survey. In the 2-month clinical phase, they practiced POCUS on patients at GPHC and received feedback from UCSF urologists. One student dropped before the OSCE and another before the clinical phase, leaving 18 who completed this initial training intervention. RESULTS: In the training phase, the average written exam score was 2.95/5. All students received 100% on the OSCE exam, which tested their ability to prepare for a scan; identify the kidney, bladder, and prostate; and interpret findings. Satisfaction surveys were scored on a Likert scale (1=not satisfied at all, 5=very satisfied); the average was 3.9. Common feedback was there should be more emphasis on renal pathologies and opportunities for hands-on practice. In the clinical phase, the average written exam score was 3.5/5. Students improved on knowing which probe to use for transabdominal scanning (90% pre-test vs. 100% post-test), the criteria for hydronephrosis (40% vs. 93%), and when to use catheterization over bladder POCUS volume measurement (25% vs. 53%). They performed worse on identifying tissue appearance on POCUS (95% vs. 60%) and similarly on differentiating urine from peritoneal fluid (45%). CONCLUSIONS: Preliminary results suggest that our virtual program is an effective alternative in teaching clinical skills. The program is satisfactory to participants. Overall, this pilot study demonstrates the efficacy of global collaborations using virtual didactics for POCUS skill instruction. Source of Funding: UCSF Center for Health Equity in Surgery and Anesthesia Seed Grant, UCSF School of Medicine Inquiry Funding Office, Harold Varmus Global Health Scholars Fund © 2022 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 207Issue Supplement 5May 2022Page: e483 Advertisement Copyright & Permissions© 2022 by American Urological Association Education and Research, Inc.MetricsAuthor Information Michelle Bui More articles by this author Adrian Fernandez More articles by this author Budheshwar Ramsukh More articles by this author Onika Noel More articles by this author Chris Prashad More articles by this author David Bayne More articles by this author Expand All Advertisement PDF DownloadLoading ...

Health systems provides care only to those people who spontaneous demand for attention; excluding those who dont perceive illness or are not aware enough to consult. Alternative healthcare models based on the nominal-personalized care like "University Center for Integrated Care of Referred Health Care" (CUIDARAS) may have better results. In order to demonstrate benefits of this model, it was performed an experience based in colorectal cancer (CRC) detection and care that focused the entire population of the town.It is an intervention study for early detection of CRC. A survey and a physical examination were performed in each adult from "CH" town. Two visits were made. Blood in stool test (BIST) was self-collected, analyzed and results delivered with appointment for a programmed video-colonoscopy (VCC) when test was positive.people enrolled (n546) had 59.9+/-6.4 yrs. Adherence was 93.8% of the target population; 99.2% performed BIST; while 95.3% a positive BIST had access to VCC and treatment. Overall cost of the experience (stool test, VCC, biopsy, local treatment) was 7685 USD, while costs associated to an advanced CRC classic treatment was USD 9577/patient (USD 26098 if treatment included bevacizumab).The present study based on preventive actions like blood in stool test, applied as a screening to all inhabitants in town, had 93.8% of adherence and high level of CRC early detection. A health model based on personalized care (CUIDARAS), achieved more effective results in terms health care and disease prevention, with a favorable benefit/cost ratio compared with classical health care provide by current system. Key words: Model of care; colorectal cancer; CUIDARAS; personalized care.

El objetivo fue analizar el efecto de diferentes tipos intercambio regulatorio y la mirada de los profesores sobre sus alumnos en las interacciones de aula, en el primer año de escuelas primarias urbanas y rurales. El estudio es descriptivo y utiliza metodología cuantitativa. Participaron 29 profesoras de escuelas urbanas y rurales de Chile. Se filmó una clase donde se usaron lentes de seguimiento ocular. Se registraron dos tipos de intercambios regulatorios: mediados (IRM) y sin mediación (IR); se calculó el tiempo de fijación de la mirada de las profesoras en los rostros de los alumnos en dichos intercambios. Se encontró que: (1) El rango promedio de fijación de la mirada de las profesoras en las caras de los estudiantes es significativamente mayor en las aulas rurales comparadas con las aulas urbanas; (2) La estructura del IRM no afecta el tiempo de fijación de la mirada de los profesores de aula.

El propósito de este trabajo es presentar de forma exploratoria y descriptiva los principales aportes de la teoría de las Representaciones Sociales de Serge Moscovici y Denisse Jodelet para la comprensión del ejercicio de la ciudadanía ambiental en el distrito de Villa el Salvador. El diseño de nuestro estudio, por su propósito, es no experimental; por su nivel, es descriptivo; por la naturaleza de los datos, es cualitativa; por el tipo de inferencia, es inductivo y analítico. El enfoque de investigación tiene su sustento epistemológico en el interaccionismo simbólico y nuestro objeto de análisis es la ciudadanía ambiental. En ese sentido, se sostiene que la teoría de las representaciones sociales, en la medida que se orienta a interpretar un tipo de conocimiento concreto, el de sentido común, se constituye como una mirada innovadora para indagar en el ejercicio de la ciudadanía.&#x0D;

To sustain and extend its discovery potential, the Large Hadron Collider (LHC) will undergo a major upgrade in the coming years, referred to as High Luminosity LHC (HLLHC), aimed to increase its instantaneous luminosity, 5 times larger than the designed limit, and, consequently leading to high levels of radiation, with the goal to collect 10 times larger the original designed integrated luminosity. The drift tube chambers (DT) of CMS muon detector system is built to proficiently measure and trigger on muons in the harsh radiation environment expected during the HL-LHC era. Ageing studies are performed at the CERNs gamma ray irradiation facility (GIF++) by measuring the muon hit efficiency of these detectors at various LHC operation conditions. One such irradiation campaign was started in October 2017, when a spare MB2 chamber moved inside the bunker and irradiated at lower acceleration factors. Two out of twelve layers of the DT chamber were operated while being irradiated with the radioactive source and then their muon hit efficiency was calculated in coincidence with other ten layers which were kept on the standby. The chamber absorbed an integrated dose equivalent to two times the expected integrated luminosity of the HL-LHC. Investigation on the outgassing of cell materials and of the gas components used at the GIF++ are underway and strategies to mitigate the aging effects are also being developed. The effect of radiation on the performance of DT chamber and its impact on the overall muon reconstruction efficiency expected during the HL-LHC are presented.

Unidad de Cuidados Intensivos Telemetricos y Departamento de Cirugia Cardiovascular, ICYCC, Fundacion Favaloro, Buenos Aires * Para optar a Miembro Titular de la Sociedad Argentina de Cardiologia Trabajo recibido para su publicacion : 7/97 Aceptado : 1/98 Direccion pare separates : Dr. Martin Bond, Unidad de Cuidados Intensivos y Telemetricos y Departamento de Cirugia Cardiovascular, ICYCC, Fundacion Favaloro, Avenida Belgrano 1746, (1425) Buenos Aires, Argentina ° Miembro Titular SAC ° FACC

ACORDE, the ALICE COsmic Ray DEtector is one of the ALICE detectors, presently under construction. It consists of an array of plastic scintillator counters placed on the three upper faces of the ALICE magnet. This array will act as Level 0 cosmic ray trigger and, together with other ALICE sub-detectors, will provide precise information on cosmic rays with primary energies around $10^{15-17}$ eV. In this paper we will describe the ACORDE detector, trigger design and electronics.

En esta tesis se analiza con detalle y documentadamente la polemica entre Pedro Martinez Lopez y Vicente Salva, mediante el estudio de sus obras y de las referencias mutuas que en ellas introducen. La investigacion se centra en dos trabajos de Martinez Lopez, de caracter lexicografico, que tienen como objeto principal los diccionarios de Vicente Salva. En la obra se determina la justicia de la critica de Martinez Lopez a Viente Salva y sus posibles repercusiones. Para ello es indispensable tener en cuenta la obra lexicografica de la Academia, por ser la fuente principal de las obras lexicograficas de Vicente Salva y elemento clave para comprender la critica de Pedro Martinez Lopez.

Esta tesis presenta el analisis de la medida de la produccion del boson de Higgs en colisiones proton-proton a una energia del centro de masas de 13 TeV. Los datos de dichas colisiones fueron tomadas por el experimento CMS durante el periodo de operacion del Run 2 (2016-2018) del Gran Colisionador de Hadrones (LHC) en el CERN. Las medidas se han realizado utilizando una muestra de sucesos cuyas caracteristicas serian compatibles con la desintegracion de un boson de Higgs a un par de bosones W, que a su vez se desintegrarian en un par de leptones cargados de distinto sabor y neutrinos. La tesis se centra en el estudio de la produccion de bosones de Higgs con el proceso de fusion de dos gluones, que es el dominante a una energia de centro de masas de 13 TeV. Se describe en primer lugar la seleccion de los elementos del analisis en la configuracion usada por CMS. Despues, los fondos principales se evaluan detalladamente y se decide como realizar una seleccion enriquecida en sucesos de senal. El principal resultado del estudio es la seccion eficaz de produccion del boson de Higgs, cuantificada mediante un modificador a la intensidad de la senal, definido como el cociente entre la seccion eficaz observada y la prediccion del Modelo Estandar. El analisis se lleva a cabo en el espacio de fases inclusivo y en determinadas regiones del espacio de fases aisladas y con una granularidad fina utilizando un modelo de secciones eficaces simplificadas (Simplified Template Cross-Sections o STXS). Los modificadores a la intensidad de la senal tanto en el analisis inclusivo como para las STXS se obtienen de un ajuste de maxima verosimilitud, usando como variables discriminantes la masa invariante de los dos leptones y la masa transversa definida utilizando el momento del sistema dileptonico y el momento faltante en el plano transverso. El valor de las incertidumbres sistematicas en el analisis tambien se adapta durante el ajuste, y se usan regiones de control para constrenir la contribucion de algunos procesos de fondo. Los eventos de la region de senal se dividen en multiples categorias, dependiendo del numero de jets reconstruidos con alto momento, el sabor de los leptones, su carga y el momento transverso del lepton de momento mas pequeno, optimizando de esta manera la sensibilidad del analisis a la senal del boson de Higgs. La intensidad de la senal se obtiene para las categorias de 0 y 1 jets, independientemente y de forma conjunta, para los datos recogidos durante cada uno de los tres anos del Run 2 y su combinacion. Todas las intensidades de senal medidas son compatibles con el Modelo Estandar. El resultado combinado para la intensidad global de la senal es ??= 0.90 +0.10/-0.09 . La precision de la medida esta dominada por efectos sistematicos que provienen del modelo teorico y de fuentes instrumentales. Los modificadores a la intensidad de la senal se determinan para la region de las STXS correspondiente a 0 jets, las 3 divisiones de la region de 1 jet dependiendo del momento transverso del boson de Higgs y para la region de alto momento transverso del boson de Higgs, que puede ser especialmente sensible a efectos de nueva fisica. Estas regiones son especificas del modo de produccion de fusion de gluones y se definen de manera completamente independiente con respecto a las regiones caracteristicas de otros modos de produccion. Los modificadores a la intensidad de senal medidos en cada una de las regiones son consistentes con la prediccion del Modelo Estandar dentro de sus incertidumbres. Finalmente, las secciones eficaces de produccion se derivan de los modificadores a la intensidad de la senal en cada region de las STXS. El resultado combinado de todas las regiones STXS para la seccion eficaz es de ? = 1.08 +0.12/-0.11 pb.

You have accessJournal of UrologyGlobal Health/Humanitarian (MP67)1 Sep 2021MP67-12 UROLOGY-DIRECTED INTERNATIONAL COLLABORATIONS THROUGH US-BASED ACADEMIC RESEARCH CENTERS Adrian Fernandez, Michelle Bui, Ian Metzler, and David Bayne Adrian FernandezAdrian Fernandez More articles by this author , Michelle BuiMichelle Bui More articles by this author , Ian MetzlerIan Metzler More articles by this author , and David BayneDavid Bayne More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000002028.12AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: International surgical collaboration presents an opportunity to address the need for specialized urologic care and teaching in low-middle income countries (LMICs) and provides invaluable opportunities for education. Longitudinal relationships between academic research centers (ARCs) and hospitals in LMICs provide an opportunity for sustainable and bilateral collaboration and education, but are often the exception. The current project seeks to identify urology-directed collaborations, organized through academic research centers (ARCs) between the United States (US) and LMICs. METHODS: The webpages of each ACGME-accredited Urology residency training program were reviewed for information regarding international outreach programs. Pubmed, Google, and Google Scholar were also searched using combinations of the terms, “global”, “international”, “partnership”, “volunteer”, and “Urology” to identify international service and education work through Urologic ARCs. We specifically sought to include programs that demonstrated active collaborations between urology training programs in the US and training urology programs or specific hospitals in LMICs for more than two consecutive years. RESULTS: One hundred and forty ACGME-accredited Urology residency training programs were included and 14/140 (10%) programs listed opportunities for international work. A total of 8/140 (6%) programs listed independent, longitudinal relationships with specific hospitals in LMICs. India and Kenya were the countries with the most affiliations with US ARCs in Urology. CONCLUSIONS: Collaborations between US ARCs in Urology and hospitals in LMICs allow for institutionally sustainable educational, clinical, and research work. At the moment, approximately 6% of ACGME accredited Urology residency programs demonstrate formal collaborations with training institutions/hospitals in LMICs as part of their online presence, suggesting an opportunity for greater global impact from formalized Urology ARCs. Source of Funding: UCSF Center for Health Equity in Surgery and Anesthesia © 2021 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 206Issue Supplement 3September 2021Page: e514-e514 Advertisement Copyright & Permissions© 2021 by American Urological Association Education and Research, Inc.MetricsAuthor Information Adrian Fernandez More articles by this author Michelle Bui More articles by this author Ian Metzler More articles by this author David Bayne More articles by this author Expand All Advertisement Loading ...

male HDL from size ranges I, II, and III with female HDL from the same size ranges showed only small differences in the mean value of the peak F/sup 0//sub 1.20/ rate, size, molecular weight, protein weight percent, and weight protein/weight phospholipid. Major differences between males and females were seen in the relative amounts of HDL in density gradient subfractions 1-3 (size range I material) and 11-12 (size range III material); the percent total HDL in the group of subfractions 1 to 3 was greatly increased in female HDL while that of the group of subfractions 11 to 12 was increased in the male HDL. These studies indicated the presence of at least three major components in HDL instead of two (HDL/sub 2/ and HDL/sub 3/) and that peak F/sup 0//sub 1.20/ rate differences in HDL schlieren patterns between males and females are a function of the relative levels of these three components.

COMO PARTE DE LA REUNION ACADEMICA LA INDUSTRIA DE ALIMENTOS ANTE LA CONTAMINACION AMBIENTAL, QUE ORGANIZO EL PROGRAMA UNIVERSITARIO DEL MEDIO AMBIENTE (PUMA), SE REALIZARON LAS MESAS REDONDAS NORMATIVIDAD Y PREVISION DE EMISIONES, CON LA PARTICIPACION DE LA BIOLOGA AIDA ALBUERNE PINA, DE LA SECRETARIA DE SALUD (SSA); EL DOCTOR ADRIAN FERNANDEZ BREMAUNTZ, DE LA SECRETARIA DEL MEDIO AMBIENTE, RECURSOS NATURALES Y PESCA; EL DOCTOR JORGE LAZCANO RAMIREZ, DE LA SSA, Y EL INGENIERO CARLOS SANDOVAL OLVERA, DIRIGENTE DEL CONSEJO NACIONAL DEL INDUSTRIAL ECOLOGISTA AC, QUIENES HABLARON SOBRE LA NECESIDAD DE ESTABLECER MEDIDAS PARA CONTROLAR Y REDUCIR LA EMISION DE CONTAMINANTES ATMOSFERICOS. SE ANOTAN DATOS DEL PLAN DE CONTROL ECOLOGICO EN LA UNAM.