I. Puljak

We present an update of the branching ratios for Higgs-boson decays in the Standard Model. We list results for all relevant branching ratios together with corresponding uncertainties resulting from input parameters and missing higher-order corrections. As sources of parametric uncertainties we include the masses of the charm, bottom, and top quarks as well as the QCD coupling constant. We compare our results with other predictions in the literature.

This Report summarizes the results of the first 10 months' activities of the LHC Higgs Cross Sections Working Group. The main goal of the working group was to present the status-of-art on Higgs Physics at the LHC integrating all new results that have appeared in the last few years. The Report is more than a mere collection of the proceedings of the general meetings. The subgroups have been working in different directions. An attempt has been made to present the first Report from these subgroups in a complete and homogeneous form. The subgroups' contributions correspondingly comprise the main parts of the Report. A significant amount of work has been performed in providing higher-order corrections to the Higgs-boson cross sections and pinning down the theoretical uncertainty of the Standard Model predictions. This Report comprises explicit numerical results on total cross sections, leaving the issues of event selection cuts and differential distributions to future publications. The subjects for further study are identified.

The reconstruction of the energy and momentum of isolated electrons in CMS combining tracking and electromagnetic calorimetry information is described. The emphasis is put on primary electrons with transverse momentum below 50 GeV/c. The energy deposited in the electromagnetic calorimeter is measured in clusters of clusters (superclusters) which collect bremsstrahlung photons emitted along the electron trajectory in the tracker volume. The electron tracks are built from seeds in the pixel detector found via a cluster-driven pixel hit matching algorithm, followed by a reconstruction of trajectories in the silicon strip tracker with a Gaussian sum filter. Electrons are classified using observables sensitive to the pattern of bremsstrahlung emission and electromagnetic showering in the tracker material. Energy scale corrections depending on the electron class are applied to the supercluster and estimates of associated errors are obtained. The electron energy is deduced from a weighted combination of the corrected supercluster energy and tracker momentum measurements. The electron direction is that of the reconstructed electron track at interaction vertex. The pre-selection of isolated electron candidates for physics analysis is described. Class-dependent observables combining tracking and calorimetry information are discussed for electron identification.

This Report summarizes the results of the activities in 2012 and the first half of 2013 of the LHC Higgs Cross Section Working Group. The main goal of the working group was to present the state of the art of Higgs Physics at the LHC, integrating all new results that have appeared in the last few years. This report follows the first working group report Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002) and the second working group report Handbook of LHC Higgs Cross Sections: 2. Differential Distributions (CERN-2012-002). After the discovery of a Higgs boson at the LHC in mid-2012 this report focuses on refined prediction of Standard Model (SM) Higgs phenomenology around the experimentally observed value of 125-126 GeV, refined predictions for heavy SM-like Higgs bosons as well as predictions in the Minimal Supersymmetric Standard Model and first steps to go beyond these models. The other main focus is on the extraction of the characteristics and properties of the newly discovered particle such as couplings to SM particles, spin and CP-quantum numbers etc.

This Report summarises the results of the second year's activities of the LHC Higgs Cross Section Working Group. The main goal of the working group was to present the state of the art of Higgs Physics at the LHC, integrating all new results that have appeared in the last few years. The first working group report Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002) focuses on predictions (central values and errors) for total Higgs production cross sections and Higgs branching ratios in the Standard Model and its minimal supersymmetric extension, covering also related issues such as Monte Carlo generators, parton distribution functions, and pseudo-observables. This second Report represents the next natural step towards realistic predictions upon providing results on cross sections with benchmark cuts, differential distributions, details of specific decay channels, and further recent developments.

The minimal SU(5) theory augmented by the fermionic adjoint representation restores the coupling constant unification and gives realistic neutrino masses and mixing through the hybrid Type I and Type III seesaw. The crucial prediction of the theory is an SU(2) lepton triplet with the mass below TeV. We study the signature of these heavy leptons and propose the strategy to test this mechanism at the hadron and lepton colliders. The smoking gun evidence of the theory is Delta L=2 lepton number violation through events of a pair of like-sign leptons plus four jets without significant missing energy at hadron colliders. We find that via this unique channel, the heavy lepton can be searched for up to a mass of 200 GeV at the Tevatron with 8 fb^-1, and up to 450 (700) GeV at the LHC of 14 TeV C.M.energy with 10 (100) fb^-1. The signal rate at the 10 TeV LHC is reduced to 60-35% for a mass of 200-700 GeV. We also comment on how to distinguish this theory from other models with similar heavy leptons. Finally, we compare the production rates and angular distributions of heavy leptons in e+e- collisions for various models.

This Report summarizes the results of the first 10 months' activities of the LHC Higgs Cross Sections Working Group. The main goal of the working group was to present the status-of-art on Higgs Physics at the LHC integrating all new results that have appeared in the last few years. The Report is more than a mere collection of the proceedings of the general meetings. The subgroups have been working in different directions. An attempt has been made to present the first Report from these subgroups in a complete and homogeneous form. The subgroups' contributions correspondingly comprise the main parts of the Report. A significant amount of work has been performed in providing higher-order corrections to the Higgs-boson cross sections and pinning down the theoretical uncertainty of the Standard Model predictions. This Report comprises explicit numerical results on total cross sections, leaving the issues of event selection cuts and differential distributions to future publications. The subjects for further study are identified.

This work summarizes the studies for the Higgs boson searches in CMS at the LHC collider. The main discovery channels are presented and the potential is given for the discovery of the SM Higgs boson and the Higgs bosons of the MSSM. The phenomenology, detector, trigger and reconstruction issues are briefly discussed.

Context. The pulsar wind nebula (PWN) 3C 58 is one of the historical very high-energy (VHE; E> 100 GeV) γ-ray source candidates. It is energized by one of the highest spin-down power pulsars known (5% of Crab pulsar) and it has been compared with the Crab nebula because of their morphological similarities. This object was previously observed by imaging atmospheric Cherenkov telescopes (Whipple, VERITAS and MAGIC), although it was not detected, with an upper limit of 2.3% Crab unit (C.U.) at VHE. It was detected by the Fermi Large Area Telescope (LAT) with a spectrum extending beyond 100 GeV.

This document summarises the talks and discussions happened during the VBSCan Split17 workshop, the first general meeting of the VBSCan COST Action network. This collaboration is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.

The avalanche photodiodes, developed by Hamamatsu Photonics in collaboration with CMS, which are to be used to read out the lead tungstate crystals in the barrel part of the CMS electromagnetic calorimeter, are described. The procedures taken to ensure their long-term reliability in the radiation environment expected in CMS are outlined, as well as the studies made to verify the very high reliability required.

The search for the Higgs boson(s) is one of the major priorities at the upgraded Fermilab Tevatron and at the CERN Large Hadron Collider (LHC). Monte Carlo (MC) event generators are heavily utilized to extract and interpret the Higgs signal, which depends on the details of the soft-gluon emission from the initial state partons in hadronic collisions. Thus, it is crucial to establish the reliability of the MC event generators used by the experimentalists. In this paper, the MC based parton shower formalism is compared to that of an analytic resummation calculation. Theoretical input, predictions and, where they exist, data for the transverse momentum distribution of Higgs bosons, ${Z}^{0}$ bosons, and photon pairs are compared for the Tevatron and the LHC. This comparison is useful in understanding the strengths and the weaknesses of the different theoretical approaches, and in testing their reliability.

This Report summarises the results of the second year's activities of the LHC Higgs Cross Section Working Group. The main goal of the working group was to present the state of the art of Higgs Physics at the LHC, integrating all new results that have appeared in the last few years. The first working group report Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables (CERN-2011-002) focuses on predictions (central values and errors) for total Higgs production cross sections and Higgs branching ratios in the Standard Model and its minimal supersymmetric extension, covering also related issues such as Monte Carlo generators, parton distribution functions, and pseudo-observables. This second Report represents the next natural step towards realistic predictions upon providing results on cross sections with benchmark cuts, differential distributions, details of specific decay channels, and further recent developments.

Further tests of lead tungstate crystal matrices made in high-energy electron beams in 1996, using new crystals, new APDs and an improved test setup confirm that an energy resolution of better than 0.6% at 100 GeV can be obtained when the longitudinal uniformity of the struck crystal is adequate. Light loss measurements under low dose irradiation are reported. It is shown that there is no loss of energy resolution after irradiation and it is demonstrated that the calibration change due to light loss can be tracked with a precision monitoring system. Successful tests with a preshower device, equipped with a silicon strip detector readout, are also described.

Using matrices of lead tungstate crystals, energy resolutions better than 0.6% at 100 GeV have been achieved in the test beam in 1995. It has been demonstrated that a lead tungstate electromagnetic calorimeter read out by avalanche photodiodes can consistently achieve the excellent energy resolutions necessary to justify its construction in the CMS detector. The performance achieved has been understood in terms of the properties of the crystals and photodetectors.

This Report documents the results obtained by the Working Group on Quantum ChromoDynamics and the Standard Model for the Workshop ``Physics at TeV Colliders'', Les Houches, France, 21 May - 1 June 2001. The account of uncertainties in Parton Distribution Functions is reviewed. Progresses in the description of multiparton final states at Next-to-Leading Order and the extension of calculations for precision QCD observables beyond this order are summarized. Various issues concerning the relevance of resummation for observables at TeV colliders is examined. Improvements to algorithms of jet reconstruction are discussed and predictions for diphoton and photon pi-zero production at the LHC are made for kinematic variables of interest regarding searches for a Higgs boson decaying into two photons. Finally, several improvements implemented in Monte-Carlo event generators are documented.

A prospective analysis is presented for the discovery of the Standard Model Higgs boson in the CMS experiment at the LHC collider. The analysis focuses on the pp → H + X → ZZ(*) + X → e+e−e+e− + X channel for Higgs boson masses in the range 120 ≲ mH ≲ 300 GeV/c2. It relies on a full simulation of the detector response and usage of new detailed electron reconstruction tools. Emphasis is put on realistic strategies for the evaluation of experimental systematics and control of physics background processes. For an integrated LHC luminosity of 30fb−1, a Standard Model Higgs boson would be observed in the e+e−e+e− channel with a significance above 3 standard deviations for masses mH in the range from about 130 to 160 GeV/c2 and above 180 GeV/c2. A discovery with a significance above 5 standard deviations is possible for this integrated luminosity around mH ≃ 150 GeV/c2 and in the range from about 190 to 300 GeV/c2. The mass (cross-section) of the Higgs boson can be determined with a precision better than 1% (30%).

The MAGIC collaboration reports the discovery of very high energy (VHE ; E>100 GeV) gamma-ray emission from the FSRQ PKS 1441+25 (RA=14h43m56.9s DEC=+25d01m44s), located at redshift z=0.939 (Shaw et al. 2012, ApJ, 748, 49). The object was observed with the MAGIC telescopes for ~2 hours during the night 2015 April 17/18, and for ~4 hours during 18/19. A preliminary analysis of the data yields a detection with a statistical significance of more than 6 standard deviations for the night of April 17/18, and more than 11 standard deviations for 18/19. This is the first time a significant signal at VHE gamma rays has been seen from PKS 1441+25. The flux above 80 GeV is estimated to be about 8e-11 cm^-2 s^-1 (16% of Crab Nebula flux). PKS 1441+25 has entered an exceptionally high state at optical, X-, and Gamma-ray frequencies (ATel #7402), which triggered the MAGIC observations. The Swift Follow-up observation from April 18/19 revealed that the high state in X-rays is continuing: http://www.swift.psu.edu/monitoring/source.php?source=PKS1441+25 MAGIC observations on PKS1441+25 will continue during the following nights, and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are R. Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de) and E. Lindfors (elilin@utu.fi). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.

The photodetectors which read out the scintillation light generated in the lead tungstate crystals in the barrel part of the Compact Muon Solenoid (CMS) electromagnetic calorimeter are avalanche photodiodes (APDs). Scanning the APD's active area with a collimated light spot, the spatial uniformity of their quantum efficiency and gain has been measured at four different operating gains. Details of the APD surface structure are examined by scanning with a fine light spot. These details help to explain the difference between the bias voltage for a given gain when the full APD area is illuminated and when only the central part is illuminated.

New projective prototypes of a scintillator/lead sandwich type sampling calorimeter Shashlik with a silicon preshower detector have been constructed and tested with an electron beam at CERN-SPS. The energy resolution is measured to be 8.7%E(GeV) in stochastic term, 0.330/E(GeV) in noise term and 0.5% in constant term. The angular resolution is better than 70 mradE(GeV).

This Report documents the results obtained by the Working Group on Quantum ChromoDynamics and the Standard Model for the Workshop ``Physics at TeV Colliders'', Les Houches, France, 21 May - 1 June 2001. The account of uncertainties in Parton Distribution Functions is reviewed. Progresses in the description of multiparton final states at Next-to-Leading Order and the extension of calculations for precision QCD observables beyond this order are summarized. Various issues concerning the relevance of resummation for observables at TeV colliders is examined. Improvements to algorithms of jet reconstruction are discussed and predictions for diphoton and photon pi-zero production at the LHC are made for kinematic variables of interest regarding searches for a Higgs boson decaying into two photons. Finally, several improvements implemented in Monte-Carlo event generators are documented.

This report documents the results obtained by the Working Group on Quantum Chromodynamics and the Standard Model for the Workshop `Physics at TeV Colliders'', Les Houches, France, 26 May - 6 June 2003. After a Monte Guide description, the first contributions report on progress in describing multiple interactions, important for the LHC, and underlying events. An announcement of a Monte Carlo database, under construction, is then followed by a number of contributions improving parton shower descriptions. Subsequently, a large number of contributions address resummations in various forms, after which follow studies of QCD effects in pion pair, top quark pair and photon pair plus jet production. After a study of electroweak corrections to hadronic precision observables, the report ends by presenting recent progress in methods to compute finite order corrections at one-loop with many legs, and at two-loop.

This document summarises the talks and discussions happened during the VBSCan Mid-Term Scientific Meeting workshop. The VBSCan COST action is dedicated to the coordinated study of vector boson scattering (VBS) from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.

This Report documents the results obtained by the Working Group on Quantum ChromoDynamics and the Standard Model for the Workshop Physics at TeV Colliders'', Les Houches, France, 21 May - 1 June 2001. The account of uncertainties in Parton Distribution Functions is reviewed. Progresses in the description of multiparton final states at Next-to-Leading Order and the extension of calculations for precision QCD observables beyond this order are summarized. Various issues concerning the relevance of resummation for observables at TeV colliders is examined. Improvements to algorithms of jet reconstruction are discussed and predictions for diphoton and photon pi-zero production at the LHC are made for kinematic variables of interest regarding searches for a Higgs boson decaying into two photons. Finally, several improvements implemented in Monte-Carlo event generators are documented.

The Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture (FESB) of the University of Split was founded in 1960. A nine-semester study programme in electrical engineering has been continuously offered ever since with specialisation in several fields. Since the academic year 2005/2006 a new study programme of electrical engineering and information technology has been introduced fully in accordance with the Bologna Declaration. All three cycles, Bachelors, Masters and Doctoral, have been set up. Currently a second year of Bachelor programme students and a first year of Doctoral programme students are attending courses and are participating in all study activities. The prevailing experiences with the implementation of the Bologna Declaration are so far quite positive, and we look forward to completing all cycles.

The MAGIC collaboration reports the discovery of very high energy (VHE ; E>100 GeV) gamma-ray emission from S3 0218+357 (RA=02h21m05.5s, DEC=+35d56m14s, J2000.0). The object was observed with the MAGIC telescopes for a total of 3.5 hours from 2014/07/23 to 2014/07/26. The preliminary analysis of these data resulted in the detection of S3 0218+357 with a statistical significance of more than 5 standard deviations. From the preliminary analysis, we estimate the VHE flux of this detection to be about 15% of the flux from the Crab Nebula in the energy range 100-200 GeV. S3 0218+357 is a gravitationally lensed blazar located at the redshift of 0.944+/-0.002 (Cohen et al., 2003, ApJ, 583, 67). Fermi-LAT observations during the flaring state of S3 0218+357 in 2012 revealed a series of flares with their counterparts after 11.46+/-0.16 days delay, interpreted as due to the gravitational lensing effect (Cheung et al. 2014, ApJ, 782, L14). On 2014 July 13 and 14 Fermi-LAT detected another flaring episode (ATel #6316). Due to the full-moon time, the MAGIC telescopes were not operational and could not observe S3 0218+357 after the original alert. However, observations scheduled at the expected time of arrival of the gravitationally lensed component led to the first significant detection of a gravitationally lensed blazar and the most distant source detected at VHE with Cherenkov telescopes to date. MAGIC observations on S3 0218+357 will continue during the next days and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are R. Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de) and J. Sitarek (jsitarek@ifae.es). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astrophysics in the energy range from 50 GeV to greater than 50 TeV.

The MAGIC Collaboration reports the discovery of Very High Energy (VHE ; E>100 GeV) gamma-ray emission from the BL Lac object 1ES 1727+502 (also known as OT546) with redshift z=0.055. The source was selected from the compilation of Costamante, L. & Ghisellini, G. 2002, A&A, 384, 56. Previous observations with the single MAGIC-I telescope yielded an upper limit on the level of 11.8% of the Crab Nebula flux above 140 GeV (J. Aleksic et al. (MAGIC Coll.), Astrophys. J. 729 (2010) 115). A total observation time of 12.5 hours was collected between 2011 May 6th to June 10th in stereoscopic mode with the two 17 m diameter imaging Cherenkov telescopes on La Palma, Canary Islands, Spain. The preliminary analysis of this data using the standard analysis chain yields a detection of 76 gamma-rays above 150 GeV, corresponding to a statistical significance of 5 standard deviations. The observed flux is estimated to be (1.7+/-0.6)% of the Crab Nebula flux above 150 GeV, well below the previous upper limit. Errors are statistical only.

We report on the activities of the ``QCD Tools for heavy flavors and new physics searches'' working group of the Run II Workshop on QCD and Weak Bosons. The contributions cover the topics of improved parton showering and comparisons of Monte Carlo programs and resummation calculations, recent developments in Pythia, the methodology of measuring backgrounds to new physics searches, variable flavor number schemes for heavy quark electro-production, the underlying event in hard scattering processes, and the Monte Carlo MCFM for NLO processes.

A study of the sensitivity for the inclusive production of Standard Model Higgs bosons ${;\rm H};$ decaying in ZZ$^{;(*)};$ pairs is presented with the CMS experiment at the CERN LHC $pp$ collider at 14 TeV centre of mass energy, for the integrated luminosity of 1 fb$^{;-1};$. The analysis is performed for the leptonic decay channels ${;\rm H}; \rightarrow {;\rm Z};{;\rm Z};^{;(*)}; \rightarrow 4\ell$ with $\ell = e, \mu$ and for a mass $m_{;\rm H};$ in the range from $120$ to $250 \GeVcc$. Signal and background datasets obtained with a detailed Monte Carlo simulation of the detector response, including the limited inter-calibration and alignment precision expected at startup luminosities, are treated using a complete reconstruction chain. A simple $m_{;\rm H};$ independent sequence of cuts is established which provides a clean sample of $4\ell$ events while preserving the highest signal detection efficiency. A signal with a significance above 2 standard deviations is found unlikely for a Higgs boson with a mass $m_{;\rm H};$ lying anywhere in the mass range considered. In absence of significant deviations from background expectations, upper limits on the production cross-section of a Standard Model-like Higgs boson can be established. The limits extend beyond existing constraints.

The first beam-test results for two- and three-bundle shashlik tower prototypes are described. We found that the spatial resolution, the uniformity of energy response, the calorimeter reliability and hermeticity and also two showers separation are improved in multi-bundle design approach.

A prospective analysis for the discovery of a light standard model Higgs boson in the CMS experiment at the large hadron collider is presented. The analysis focuses on the inclusive single production p + p → H + X and the Higgs boson decay channel H → WW ( * ) → e + νe - ν, for a Higgs boson mass M H in the range 120 < M H < 160 GeV/c 2 . A full simulation of the detector response is performed and detailed electron, jet and missing transverse energy reconstruction algorithms are used. Emphasis is put on a realistic treatment of background contamination and systematics. A Higgs boson of mass M H ≥ 134 GeV/c 2 would be observed with a significance above three standard deviations in the e + νe - ν channel alone for an integrated LHC luminosity above 30 fb -1 .

This document summarises the talks and discussions happened during the VBSCan Mid-Term Scientific Meeting workshop. The VBSCan COST action is dedicated to the coordinated study of vector boson scattering (VBS) from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.

The Les Houches Workshop on Physics at TeV Colliders took place from June 8-18, 1999. One of the three working groups at Les Houches concentrated on QCD issues, both at the Tevatron Collider and at the LHC. Besides the interest in QCD in its own right, QCD dynamics plays an important role in the production mechanisms for any new physics process that might be observed at either collider, as well as any processes that may form backgrounds to the new physics. This writeup serves both as a pedagogical overview of QCD as well as an update on the current status of the field.

The reconstruction of the four-momentum of electrons in CMS combining tracking and electromagnetic calorimetry information is described.Electrons in the energy range from 5 to 100 GeV are considered. Different electron topologies, depending on the amount of bremsstrahlung and re-interaction in the inner tracker material, are identified to select the most adapted energy scale correction for the electron supercluster and to estimate the associated error. The electron tracks are built starting from a cluster-driven seed finding in the pixel detector, followed by a Gaussian Sum Filter technique to build and fit trajectories in the Silicon Tracker Detectors. The electron four-momentum is deduced from a combination of the supercluster energy and tracker momentum measurements, with the direction taken from the electron track at interaction vertex.

corresponds to a , while higher-order processes provide kicks as the recoils against quarks and gluons. At large values the bulk of the comes from one hard emission, and perturbation theory is a reasonable approach. In the small- region, on the other hand, many emissions can contribute with kicks of comparable size, and so the order-by-order approach is rather poorly convergent. Furthermore, in this region nonperturbative effects may start to become non-negligible relative to the perturbative ones. The traditional solution has been to apply either an analyti cal resummation approach or a numerical parton-shower one. These methods to some extent are complementary. The norm today is for showers to be based on an improved leading-log picture, while resummation is carried out to next-to-leading logs. However, resummation gives no information on the partonic system recoiling against the , while showers do, and therefore can be integrated into full-fledged eve nt generators, allowing accurate experimental studies. In both approaches the high- tail is constrained by fixed-order perturbation theory, so t he interesting and nontrivial region is the low-to-medium- one. Both also require nonperturbative input to handle the low- region, e.g. in the form of a primordial carried by the initiator of a shower. One of the disconcerting aspects of the game is that a large primordial seems to be required and that the required value of this primordial can be dependent on the kinematics of the process being considered. Confinement of partons inside the proton imp lies a GeV, while fits to

The MAGIC and VERITAS telescopes have observed relatively long-duration flaring activity from the blazar 1ES 1011+496 at z = 0.212 (RA=10h 15m 04.1s, Dec=+49d 26m 01s). The brightest very high energy (VHE ; >100 GeV) gamma-ray flux previously recorded from this blazar is approximately 7% of the flux (>200 GeV) observed from the Crab Nebula (J. Albert et al. 2007, ApJ 667, L21). Recent VERITAS and MAGIC observations exceed roughly 10 times this flux. VERITAS observations were taken almost every night between February 3, 2014 UTC (MJD 56691) and February 11, 2014 (MJD 56699). The preliminary analysis of all good-weather data yields a strong signal of about 3300 gamma rays in 13 hours of exposure, corresponding to a statistical significance of 43 standard deviations. The observed nightly integral flux above 200 GeV ranges between 25% and 75% of the flux measured by MAGIC from the Crab Nebula. Following a VERITAS alert to ground-based VHE observatories, the MAGIC telescopes observed the source nightly from February 6, 2014 UTC (MJD 56694) through February 11, 2014 (MJD 56699). The preliminary analysis of these data results in integral fluxes above 200 GeV (nightly averaged) ranging between of 45% and 75% of the flux from the Crab Nebula. Follow-up observations were also taken with Swift XRT / UVOT and at optical wavelengths. The 0.3-10 keV X-ray flux of 1ES1011+496 is also at the highest level ever seen by Swift (http://www.swift.psu.edu/monitoring/). The latest MAGIC and VERITAS observations performed on the night of February 11, 2014 show the high VHE flux persists. The MAGIC and VERITAS telescopes are entering the full Moon period, however the observations will be resumed on February 20, 2014 (UTC), if the weather conditions permit. Additional multiwavelength observations are encouraged. MAGIC is a system of two 17m-diameter imaging atmospheric Cherenkov telescopes (IACTs) located at the Canary island of La Palma, Spain. VERITAS is an array of four 12-m diameter IACTs located near Tucson, Arizona, USA. VERITAS and MAGIC are sensitive to astronomical sources of gamma-rays with energies ranging from approximately 50 GeV to greater than 50 TeV.

The blazar S5 0716+714 was recently reported to be at exceptionally high optical state (ATel#6902, ATel#6942, ATel#6944, ATel#6953, ATel#6957), which triggered MAGIC observations of the source in very high energy gamma rays (VHE, E>100 GeV). The preliminary analysis of the MAGIC data taken between 2015/01/22 and 2015/01/26 indicates potentially variable VHE flux in the range from 4x10^-11 cm^-2 s^-1 to 7x10^-11 cm^-2 s^-1 above 150GeV. S5 0716+714 is a blazar with z~0.31 (Nilsson et al. 2008, A&A...487L..29N), which was reported as VHE emitter in 2008 (Anderhub et al. 2009, ApJ, 704, 129). The measured integral flux above 400 GeV was (7.5 +- 2.2) * 10^-12 cm^-2 s^-1. The 2008 detection is the only significant detection of VHE gamma-ray emission prior to observations reported here. Notably, the 2008 MAGIC detection of the source took place during a high optical state, too. The MAGIC observations were accompanied with simultaneous optical observations with the KVA telescope. The R-band magnitude on 2015/01/26 was 11.84, the lightcurve is available at: http://users.utu.fi/kani/1m/S5_0716+714.html MAGIC observations on S5 0716+714 will continue for one more night and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are R. Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de) and E. Lindfors (elilin@utu.fi). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.

The MAGIC collaboration reports the discovery of very high energy (VHE ; E>100 GeV) gamma-ray emission from RX J1136.5+6737 (a.k.a. RBS 1004) (RA: 11:36:30.1 DEC: +67:37:04, J2000) at redshift z=0.1342. RX J1136.5+6737 is an X-ray bright high-peaked frequency BL Lac object as listed in the MAXI 3-year catalog (Hiroi et al. 2013), which includes 13 BL Lacs (all HBLs and 9 TeV HBLs). The source has also been detected by Fermi-LAT, in the Second Fermi-LAT source catalog (2FGL ; Nolan et al. 2012) with a hard photon index 1.68+/-0.12, and belongs to the first Fermi-LAT catalog of >10 GeV sources (1FHL ; Ackermann et al, 2013), showing bright (photon flux = 11.7e-11 ph cm^-2 s^-1) emission above 10 GeV, and identified as a good candidate for VHE detection. RX J1136.5+6737 was observed with the MAGIC telescopes starting on 2014 January 29. Data taken up to 2014 April 3 (about 20 hours in total) yielded a source detection with a statistical significance of more than 5 standard deviations. The averaged flux measured by MAGIC during the 2014 observations corresponded to about 1.5% of the Crab nebula at energies above 200 GeV. MAGIC is planning to resume observations of the source on April 18th (right after the full-moon break). Multi-wavelength observations are encouraged.

The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of sqrt(s[NN]) = 5.02 TeV, as well as results from charm quark jets in proton-proton (pp) collisions at sqrt(s) = 2.76 and 5.02 TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400 GeV/c in pPb collisions at sqrt(s[NN]) = 5.02 TeV of R[pA] = 0.92 +/- 0.07 (stat) +/- 0.11 (syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by PYTHIA 6 for pp collisions at sqrt(s)= 2.76 and 5.02 TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c.

The MAGIC collaboration observed SN2014J, the nearest supernova (SN) explosion in 10 years, located in the galaxy M82. The MAGIC observations started 6 days after the first detection by the UCL Observatory (CBET #3792) and amounted to a total of 5.4 hours. This Ia-type SN is unique and follow-up observations in all wavelengths have been pursued (i.e. ATel #5835, #5809, #5812, #5851). The SN was observed with the MAGIC telescopes from January 27 to 29 under moderate moonlight conditions and on February 1 and 2 under dark-night conditions. The preliminary analysis of these data resulted in an integral flux upper limit of 1.6e-12 cm-2 s-1 above the energy 300 GeV at 95% c.l. (this corresponds to ~1.3% of the Crab Nebula flux ; for energies above 700 GeV the corresponding limit is ~2%), assuming a Crab-like spectral index. The daily flux upper limits (~1h observation per day) vary from 1.8e-12 to 18.e-12 cm-2 s-1 (E>300 GeV, 95% c.l.), due to different observational conditions. The VHE flux contribution from the host galaxy M82 was previously measured by VERITAS (Nature, 462, 700) at the level of 0.9% of the Crab flux for E>700 GeV. The MAGIC observations covered the maximum of the SN brightening (on Jan 31, mag=10.5 AAVSO data: PSN J09554214+6940260). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.

The source PG 1553+113 is a well-known TeV emitter, likely located at redshift 0.4-0.5 (Danforth et al. 2010). Its state has been monitored by MAGIC since February 2005. In March 2012, a high emission state at VHE, X-ray, optical, and infrared wavelengths was reported (ATel #3977). During the night of April 19-20th (MJD 56037), the source was observed by MAGIC for a total of 1.1 hour of good quality data. A strong signal corresponding to a statistical significance above 15 standard deviations in the VHE range was detected. The level obtained with the preliminary analysis reaches the Crab Nebula flux level at ~100 GeV. It is the highest state of PG 1553+113 ever detected at these energies. The mean flux at 100 GeV measured by MAGIC between 2005 and 2009 was ~50% of the Crab Nebula flux (J. Aleksic et al., 2012). Follow up observations carried out in the following nights confirm that the source persists in this high state. Simultaneous optical observations performed in the R band by the KVA telescope also show increased emission. The maximum flux reached is 13.14 ± 0.01 mJy (MJD 56040). The source is brighter than during the high state reported one month ago (12.2 ± 0.2 mJy ; http://users.utu.fi/kani/1m/PG_1553+113_jy.html ). Optical polarimetric observations were taken with the Liverpool telescope as part of a joint observational program with MAGIC. Preliminary photometric observations in the J, H and K bands with the REM telescope show an increasing activity of the source during the last week. In addition, automatic analysis procedures applied to Swift/XRT data collected on April 17th and 21st indicate that the source is also brightening in X rays. The preliminary Swift/XRT lightcurve is publicly available at: http://www.swift.psu.edu/monitoring/data/PG1553+113/lightcurve.png. Dedicated analyses are in progress. Given the high activity detected, we strongly encourage multi-wavelength observations of the source.

Following the communication from the Fermi-LAT collaboration on February 1st that PKS 1510-089 (z=0.36, R.A.= 15h 12m 50.5s, Dec.=-09d 05m 59.8s, J2000) underwent spectral hardening in MeV-GeV range (Dave Thompson, priv. comm. to TeV facilities) and ATel #3907 announcing enhanced gamma-ray emission observed by AGILE on February 2nd, the source was observed by MAGIC starting on February 3rd, just before the full moon shut down. The observations were resumed on February 19th and in total ~10 hours of data have been collected. The preliminary analysis of the data reveals a clear signal with a statistical significance of >5 sigma. The source had been previously detected to emit VHE gamma-rays by the H.E.S.S. telescope array in 2009 (Wagner, S., & Behera, B. 2010, 10th HEAD Meeting). Simultaneous to the MAGIC observations we have obtained optical R-band photometry and polarimetry with the KVA and Liverpool Telescopes. The source has undergone a minor optical outburst with a maximum brightness of R=15.3 (~2.3 mJy) measured on February 25th compared to a maximum brightness of R=13.1 (18 mJy) during the major outburst in 2009. The optical polarization has remained between 3% and 9% which is within the typical range for this quasar.

The Les Houches Workshop on Physics at TeV Colliders took place from June 8-18, 1999. One of the three working groups at Les Houches concentrated on QCD issues, both at the Tevatron Collider and at the LHC. Besides the interest in QCD in its own right, QCD dynamics plays an important role in the production mechanisms for any new physics process that might be observed at either collider, as well as any processes that may form backgrounds to the new physics. This writeup serves both as a pedagogical overview of QCD as well as an update on the current status of the field.

A study of the sensitivity for the inclusive production of Standard Model Higgs bosons H decaying in ZZ(*) pairs is presented with the CMS experiment at the CERN LHC pp collider at 14 TeV centre of mass energy, for the integrated luminosity of 1 fb−1. The analysis is performed for the leptonic decay channels H→ZZ(*)→4l with l = e, μ and for a mass mH in the range from 120 to 250 GeV/c2. A simple mH independent sequence of cuts is established which provides a clean sample of 4l events while preserving the highest signal detection efficiency. A signal with a significance above 2 standard deviations is found unlikely for a Higgs boson with a mass mH lying anywhere in the mass range considered. In absence of significant deviations from background expectations, upper limits on the production cross‐section of a Standard Model‐like Higgs boson can be established. The limits extend beyond existing constraints.

The MAGIC Collaboration reports the discovery of Very High Energy (VHE ; >100 GeV) gamma-ray emission from the High Frequency peaking BL Lac object B3 2247+381 with z=0.1187. The source is positionally consistent with the Fermi-LAT gamma-ray source 1FGL J2250.1+3825 (RA 22 50 06.6 dec +38 25 58, J2000), which was flagged as a promising VHE source candidate by the Fermi-LAT collaboration, information which was shared with the MAGIC collaboration (as well as other IACTs) back in October 2009. The MAGIC observations were triggered by an optical high-state of the source, reported by the Tuorla blazar monitoring program (http://users.utu.fi/kani/1m/B3_2247+381.html). The VHE detection is based on a 9.3 hour-long observation performed on 2010 September 30th, October 1st, 2nd, 4th, 5th and 6th in stereoscopic mode with the two 17m diameter imaging Cherenkov telescopes on La Palma, Canary Islands, Spain. The preliminary analysis of the MAGIC data using standard cuts yields a detection of 64 gamma-rays above 150 GeV, corresponding to a pre-trial statistical significance of 5 standard deviations. The observed flux is estimated to be ~2% of the Crab nebula flux above 150 GeV. Target of Opportunity Observations with Swift have also been performed on this source location. A preliminary analysis of the Swift/XRT data shows that the X-ray flux from the source is ~4 times higher than during last observation (spring 2010). Further Swift observations are expected until October 15. We thank the Swift team for accepting and promptly scheduling the X-ray observations. MAGIC will continue observations of B3 2247+381. Observations at other wavelengths are encouraged.

A high granularity calorimeter is presently being designed by the CMS collaboration to replace the existing endcap detectors.It must be able to cope with the very high collision rates, imposing the development of novel filtering and triggering strategies, as well as with the harsh radiation environment of the high-luminosity LHC.In this paper we present an overview of the full electronics architecture and the performance of prototype components and algorithms.

In this note, we combine the results obtained in two recent Monte Carlo analyses setting strategies for early Higgs boson searches in the $H \rightarrow WW^{;(*)}; \rightarrow 2\ell 2\nu$ and $H \rightarrow ZZ^{;(*)}; \rightarrow 4\ell$ decay channels, where $\ell$ stands for $e$ or $\mu$. We show that these two channels alone should allow for excluding the Standard Model Higgs boson in the mass range of 140-230 GeV by the time when CMS collects 1~fb$^{;-1};$ of data at a center-of-mass energy of 14 TeV. We also give an estimate of how the change of the LHC center-of-mass collision energy from 14 to 10 TeV would impact the Higgs boson searches.

Na CERN-u su u toku zadnje pripreme za pustanje u pogon LHCa. Na tom sudarivacu ce se proucavati sudari protona na energiji centra mase od 14 TeV. Eksperimentalni program LHC obuhvaca siroki spektar otvorenih pitanja u fizici elementarnih cestica: porijeklo masa bozona i fermiona, potraga za kandidatima tamne tvari, kvarkgluonska plazma, simetrija materija-antimaterija, itd. Visegodisnja faza razvoja i izgradnje LHC detektora zavrsila je 2008. godine i 4 velika detektora ALICE, ATLAS, CMS i LHCb su danas spremna za snimanje prvih sudara. U protekloj godini su LHC detektori snimili vecu kolicinu kozmickih zraka, pomocu kojih su se mogle testirati performanse raznih podsustava detektora i sustava prikupljanja podataka, kao i razne metode kalibracije detektora. Također su se proucile karakteristike spektra kozmickih miona. Na jesen 2009. se ocekuju prva mjerenja proton-proton sudara. Predavanje ce se uz navedeno osvrnuti i na mjerenja koja se ocekuju u ranoj fazi LHC-a, od provjera standardnog modela do prvih potraga za novom fizikom.

Rezultati kolaboracije MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) su otkrice pulsne emisije gama-zraka iz okoline pulsara u podrucju Rakove maglice, sto iskljucuje model polarne kape, te detekcija visokoenergijskih gama-zraka iz aktivne galakticke jezgre 3C 279 udaljene vise od 5 milijardi svjetlosnih godina, sto ukazuje na vecu transparentnost svemira. Hrvatska grupa u kolaboraciji MAGIC radi na poboljsanju metode gama/hadron separacije na niskim energijama, analizi visokoenergijskog gama-zracenja iz aktivnih galaktickih jezgri i pulsara. Prvi projekt iz podrucja astrocesticne fizike koji ce financirati ASPERA (mreža nacionalih agencija za finaciranje projekata iz astrocesticne fizike) je projekt CTA (Cherenkov Telescope Array), opservatorij visokoenergijskog gamazracenja kojeg ce ciniti dvjestotinjak teleskopa razlicitih velicina.

Opažanje aktivnih galaktickih jezgri (AGN) u podrucju gama–zraka može omoguciti bolje razumijevanje relativistickih mlazova supermasivnih crnih rupa, a time i mehanizama nastanka visokoenergijskih cestica pri akreciji tvari u crnu rupu. Galaksija M87 je za sada jedina radio galaksija koja ne pripada skupiti blazara u cijem su spektru opažene visokoenergijske gama–zrake. Kolaboracija MAGIC vec niz godina prati i istražuje ponasanje M87 u podrucju visokih energija. MAGIC (Major Atmospheric Gamma Imaging Cherenkov) teleskop je optimiziran za opažanje i bilježenje Cerenkovljevog zracenja u Zemljinoj atmosferi koje stvara gama–zracenje iz svemira. U ovom radu predstavljen je MAGIC teleskop, te postupak i rezultati analize opažanja M87.

The MAGIC collaboration reports the detection of the blazar S5 0716+714 (z=0.31+-0.08) in very high energy gamma-rays. The observations were performed in November 2007 and in April 2008, and were triggered by the KVA telescope due to the high optical state of the object. An overall significance of the signal accounts to S =5.8 sigma for 13.1 hours of data. Most of the signal comes from the April 2008 data sample during a higher optical state of the object suggesting a possible correlation between the VHE gamma-ray and optical emissions. The differential energy spectrum of the 2008 data sample follows a power law with a photon index of Gamma = 3.45+-0.54_(stat)+-0.2_(sys), and the integral flux above 400 GeV is at the level of (7.5+-2.2_(stat)+-2.3_(sys))* 10^-12 cm^-2 s^-1. Modeling of the broad band spectral energy distribution indicates that a simple one zone synchrotron self-Compton model cannot describe the available data well whereas the structured jet model can.

A prospective analysis for the discovery of a light standard model Higgs boson in the CMS experiment at the large hadron collider is presented. The analysis focuses on the inclusive single production p + p → H + X and the Higgs boson decay channel , for a Higgs boson mass MH in the range 120 < MH < 160GeV/c2. A full simulation of the detector response is performed and detailed electron, jet and missing transverse energy reconstruction algorithms are used. Emphasis is put on a realistic treatment of background contamination and systematics. A Higgs boson of mass MH 134GeV/c2 would be observed with a significance above three standard deviations in the channel alone for an integrated LHC luminosity above 30 fb−1.

CMS (Compact Muon Solenoid) je detektor opce namjene za mjerenje fizikalnih događaja u sudarima protona na LHC-u (Large Hadron Collider). Optimiziran je za potragu za Higgsovim bozonom u relevantnom podrucju masa, od donje granice od 114, 4 GeV/c2, postavlje direktnim mjerenjima na LEP-u (Large Electron Positron Collider), pa sve do mase od oko 1 TeV/c2. U ovom radu bit ce prezentiran potencijal CMS detektora za pronalazak Higgsovog bozona, s naglaskom na potragu kroz raspad H → ZZ(*)→ l+l− l+l− (l predstavlja elektrone, mione i njihove anticestice). Rezultati pokazuju da ce se Higgsov bozon moci pronaci kroz ovaj kanal raspada vec pri integriranom luminozitetu od 3 fb-1, ako je njegova masa oko 150 GeV/c2 ili veca od oko 190 GeV/c2. U drugom dijelu rada bit ce prezentiran potencijal CMS detektora za mjerenje proizvodnje dvaju baždarnih bozona (ZZ i WZ), kroz njihove leptonske raspade, te ce biti pokazano da se ovaj signal može mjeriti u ranoj fazi eksperimenta, pri integriranom luminozitetu manjem od 1 fb-1. Svi rezultati prikazani u ovom radu dobiveni su koristeci potpunu Monte Carlo simulaciju CMS detektora i novo razvijene algoritme za rekonstrukciju elektrona i miona te realisticnu procjenu sistematskih efekata.

This document summarises the talks and discussions happened during the VBSCan Split17 workshop, the first general meeting of the VBSCan COST Action network. This collaboration is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders.

U skladu s obvezama koje proizlaze iz Zakona o visokom obrazovanju i znanstvenoj djelatnosti, u akademskoj godini 2005/06. FESB je ustrojio nove studijske programe sukladne temeljnim odrednicama Bolonjske deklaracije. Ovim postupkom ucinjen je prvi važan korak prema usklađivanju s buducim europskim visokoobrazovnim prostorom.

The VERITAS and MAGIC collaborations report the detection of an enhanced TeV gamma-ray flux from the pulsar/ Be-star binary system PSR J2032+4127/ MT91 213 (RA 20h32m13.13s, Dec +41d27m24.4s, J2000.0). The binary nature of this system was identified in 2015 through radio and gamma-ray timing observations (Lyne et al., MNRAS, 451, 581, 2015). The orbital period is estimated at 45-50 years, with periastron expected to occur around November 2017. The X-ray flux has been steadily increasing as the system approaches periastron (Bird et al., arXiv:1708.04718). PSR J2032+4127 is co-located with the extended TeV gamma-ray source, TeV J2032+4130, and may be physically associated with it. Both VERITAS and MAGIC observations were conducted as part of a coordinated long-term monitoring campaign. The source was observed most recently by VERITAS between 16 September and 27 September 2017 for a total exposure of 15.3 hours. In a preliminary analysis, the integral flux measured by VERITAS above 200 GeV is 4.2e-12 ± 0.7e-12 photons cm^-2 s^-1 (~2% of the Crab Nebula flux), corresponding to approximately twice the flux measured at the same location in archival VERITAS observations from spring 2017. The emission is consistent with a point source at the location of PSR J2032+4127, offset from the center of the previously known extended TeV source. The VERITAS source name is VER J2032+414. The statistical significance of the gamma-ray excess at the pulsar position is 6.8 standard deviations. MAGIC observations comprise 5.6 hours taken between 10 September and 25 September. A preliminary analysis of the MAGIC data indicates a flux of 5.6e-12 ± 1.2e-12 photons cm^-2 s^-1 above 200 GeV, which implies an increase by about a factor of 2 with respect to the mean flux observed by MAGIC in June-August 2017. The MAGIC source name is MAGIC J2032+4127. The gamma-ray flux is predicted to continue to increase over the coming months (e.g. Takata et al., ApJ, 836, 241), and VERITAS and MAGIC observations will continue with highest priority. We strongly encourage coordinated multiwavelength observations.

A search for resonance like structures in the B0sπ± invariant mass spectrum is performed using proton-proton collision data collected by the CMS experiment at the LHC at √s=8 TeV, corresponding to an integrated luminosity of 19.7 fb−1. The B0s mesons are reconstructed in the decay chain B0s→J/ψϕ, with J/ψ→μ+μ− and ϕ→K+K−. The B0sπ± invariant mass distribution shows no statistically significant peaks for different selection requirements on the reconstructed B0s and π± candidates. Upper limits are set on the relative production rates of the X(5568) and B0s states times the branching fraction of the decay X(5568)±→B0sπ±. In addition, upper limits are obtained as a function of the mass and the natural width of possible exotic states decaying into B0sπ±.

Shashlik calorimeter prototypes equipped with preshower detector have been tested in 3 T magnetic field with electron beam at CERN-SPS. The signal from electrons increases as much as 11% at 3 T magnetic field. No significant deterioration on the energy resolution as well as the preshower detector performance have been observed.

This paper describes a comparison of most of the available predictions for the cross section and transverse momentum distribution for a 125 GeV mass Higgs at the LHC, including those from the PYTHIA and HERWIG parton shower Monte Carlos and from four resummation calculations.

The transverse momentum spectra of the Z and Higgs bosons are studied, as probes of the consequences of multiple parton emissions in hadronic events. Emphasis is put on constraints, present in showers, that go beyond conventional leading log. It is shown that, if such constraints are relaxed, better agreement can be obtained with experimental data and with resummation descriptions.

The Compact Muon Solenoid is one of two general purpose detectors currently being constructed for the Large Hadron Collider at CERN foreseen to begin data taking in 2007. Avalanche Photo Diodes (APDs) have been chosen to detect the scintillation light of the 61 200 lead tungstate crystals in the barrel part of the electromagnetic calorimeter of CMS. After a 8 years long R&D work Hamamatsu Photonics produces now APDs with a structure that is basically radiation resistant. Since a reliability of 99.9% is required, a method to detect weak APDs before they are built into the detector had to be developed. The described screening method is a combination of an irradiation with 60Co and annealing under bias of all APDs and on a sampling basis only an irradiation with hadrons.

Efficiency and precision in electron reconstruction is of ultimate importance for Higgs boson search at LHC through Higgs decay to four electrons. Main problems in electron reconstruction at CMS are reviewed and solution proposed