Hale Sert

A bstract We describe a proposal to add a set of very forward detectors to the CMS experiment for the high-luminosity era of the Large Hadron Collider to search for beyond the standard model long-lived particles, such as dark photons, heavy neutral leptons, axion-like particles, and dark Higgs bosons. The proposed subsystem is called FACET for F orward- A perture C MS E x T ension, and will be sensitive to any particles that can penetrate at least 50 m of magnetized iron and decay in an 18 m long, 1 m diameter vacuum pipe. The decay products will be measured in detectors using identical technology to the planned CMS Phase-2 upgrade.

In supersymmetric extensions of the Standard Model, higgsino-like charginos and neutralinos are preferred to have masses of the order of the electroweak scale by naturalness arguments. Such light $\widetilde{\chi}^{0}_{1}$ , $\widetilde{\chi}^{0}_{2}$ and $\widetilde{\chi}^{\pm}_{1}$ states can be almost mass degenerate, and their decays are then difficult to observe at colliders. In addition to the generic naturalness argument, light higgsinos are well motivated from a top-down perspective. For instance, they arise naturally in certain models of hybrid gauge-gravity mediation. In the present analysis, we study two benchmark points which have been derived in the framework of such a model, which exhibit mass differences of $\mathcal {O}(\mathrm {GeV})$ in the higgsino sector. For chargino-pair and neutralino associated production with initial-state photon radiation, we simulate the detector response and determine how accurately the small mass differences, the absolute masses and the cross sections can be measured at the International Linear Collider. Assuming that 500 fb−1 has been collected at each of two beam-polarisations P(e +,e −)=(±30 %,∓80 %), we find that the mass differences can be measured to 40–300 MeV, the cross sections to 2–5 %, and the absolute masses to 1.5–3.3 GeV, where the range of values correspond to the different scenarios and channels. Based on these observables we perform a parameter fit in the MSSM, from which we infer that the higgsino mass parameter μ can be measured to a precision of about Δμ=2–7 GeV. For the electroweak gaugino mass parameters M 1, M 2, which are chosen in the multi-TeV range, a narrow region is compatible with the measurements. For both parameters independently, we can determine a lower bound.

We study Higgs boson masses in supersymmetric models with an extra U(1) symmetry to be called U(1)′. Such extra gauge symmetries are urged by the μ problem of the MSSM, and they also arise frequently in low-energy supersymmetric models stemming from GUTs and strings. We analyze mass of the lightest Higgs boson and various other particle masses and couplings by taking into account the LEP bounds as well as the recent bounds from Tevatron experiments. We find that the μ-problem motivated generic low-energy U(1)′ model yields Higgs masses as large as ∼200GeV and violate the Tevatron bounds for certain ranges of parameters. We analyze correlations among various model parameters, and determine excluded regions by both scanning the parameter space and by examining certain likely parameter values. We also make educated projections for LHC measurements in light of the Tevatron restrictions on the parameter space. We further analyze certain benchmark models stemming from E(6) breaking, and find that they elevate Higgs boson mass into Tevatron's forbidden band when U(1)′ gauge coupling takes larger values than the one corresponding to one-step GUT breaking.

We study the anomalous magnetic moment of the muon in supersymmetric ${E}_{6}$ models and generic $\mathrm{U}(1{)}^{\ensuremath{'}}$ models to probe the model reactions and to find constraints on the large parameter space of these models. For future searches, by imposing the existing bounds coming from collider searches and theoretical considerations upon the $\mathrm{U}(1{)}^{\ensuremath{'}}$ model parameters, we examine the lightest Higgs boson mass ${m}_{h}$ and the mass of the additional $Z$ boson ${m}_{{Z}_{2}}$ in such singlet extensions of the MSSM. We observed that not only supersymmetric ${E}_{6}$ models but also generic $\mathrm{U}(1{)}^{\ensuremath{'}}$ models are sensitive to the imposition of the considered bounds. Indeed, without the muon anomaly constraints ${E}_{6}$ models and generic $\mathrm{U}(1{)}^{\ensuremath{'}}$ models can predict ${m}_{h}$ as large as $\ensuremath{\sim}150\text{ }\text{ }\mathrm{GeV}$ and $\ensuremath{\sim}180\text{ }\text{ }\mathrm{GeV}$, respectively. However, in addition to the mentioned constraints when a $1\ensuremath{\sigma}$ range for the anomalous magnetic moment of the muon is considered, we observe that generic $\mathrm{U}(1{)}^{\ensuremath{'}}$ models do not favor the mass of the lightest Higgs boson to be larger than 140 GeV; it should be smaller than 135 GeV in ${E}_{6}$ models.

Türkiye’nin modernleşme serüvenine kültürel bir cevap olarak ortaya çıkışının ardından uzun süre görmezden gelinen ya da yozlaşmanın ve yabancılaşmanın müziği olarak ötelenen arabesk, elitist ve dışlayıcı tavırlar kadar resmi yasaklama ve ambargoların da nesnesi olmuştur. Ancak yaslandığı toplumsal dinamiklerin de yardımıyla kitlesel bir yayılma gösteren arabesk olgusu, giderek şehrin kültürel kodlarına eklemlenmiş; dahası bu kodları bozup yeniden üreterek baskın bir popüler kültür ögesi haline evrilmiştir. Arabeske yönelik dışlayıcı yaklaşımların temel teorik zeminini Muhafazakâr-elitist ekol ile Frankfurt Okulu geleneğine dayandırmak mümkündür. Fakat uzlaşması çok da mümkün görünmeyen bu iki geleneği popüler kültür karşıtlığında buluşturan seçkinci yaklaşımlar, Türkiye’de arabesk olgusuna dair sağlıklı çözümlemeler yapabilmeyi imkânsız kılan bir entelektüel vasat doğurmuştur. Bu vasatı kırmak üzere İngiliz Kültürel Çalışmalar geleneğinin izini takip eden bazı aydınlar, bu geleneğin popüler kültüre atfettiği olumlu çağrışımları arabeski anlamak ve onu dönüştürmek üzere geliştirdikleri çalışmalara taşımışlardır. Bu çalışmada, modernleşme ile gelenek arasındaki gerilimli birlikteliğin ve Türkiye’nin kendine has modernleşme serencamının çeşitli kültürel tezahürlerinden biri olan “arabesk” olgusuna dair çeşitli yaklaşımlar, bahsi geçen kuramsal farklılıklar etrafında ele alınmıştır. 1960’larla başlayan arabesk furyasının dönemsel dönüşümlerine değinilmiş, arabesk müziğin periferiden merkeze doğru seyreden yolculuğu sırasında, sahip olduğu organik niteliklerden ve taşıdığı muhalif anlamlardan soyunarak tamamladığı öyküsü üzerinde durulmuştur.

The Compact Muon Solenoid (CMS) experiment selects events with a two-level trigger system, the Level-1 (L1) trigger and the High Level trigger (HLT).The HLT is a farm of approximately 30K CPU cores that reduces the rate from 100 kHz to about 1 kHz.The HLT has access to the full detector readout and runs a streamlined version of the offline event reconstruction.In LHC Run 2 the peak instantaneous luminosity reached values above 2 × 10 34 cm -2 s -1 , posing a challenge to the online event selection.An overview of the object reconstruction and trigger selections used in the 2016-2018 data-taking period will be presented.The performance of the main trigger paths and the lessons learned will be summarised, also in view of the coming LHC Run 3.