رسالة جامعية
Study of radiative decays Z$^0 \rightarrow \mu\mu\gamma$ and search for Higgs bosons in the H$\rightarrow \gamma\gamma$ channel, in the CMS experiment at LHC (CERN) ; Etude des désintégrations radiatives Z$^0 \rightarrow \mu\mu\gamma$ et recherches du boson de Higgs dans le canal H$\rightarrow \gamma\gamma$ dans l'expérience CMS au LHC (CERN)
| العنوان: | Study of radiative decays Z$^0 \rightarrow \mu\mu\gamma$ and search for Higgs bosons in the H$\rightarrow \gamma\gamma$ channel, in the CMS experiment at LHC (CERN) ; Etude des désintégrations radiatives Z$^0 \rightarrow \mu\mu\gamma$ et recherches du boson de Higgs dans le canal H$\rightarrow \gamma\gamma$ dans l'expérience CMS au LHC (CERN) |
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| المؤلفون: | Bondu, Olivier |
| المساهمون: | CMS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard - Lyon I, Susan Gascon-Shotkin(s.gascon-shotkin@ipnl.in2p3.fr) |
| المصدر: | https://theses.hal.science/tel-00914252Test ; Physique des Hautes Energies - Expérience [hep-ex]. Université Claude Bernard - Lyon I, 2012. Français. ⟨NNT : ⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2012 |
| المجموعة: | HAL Lyon 1 (University Claude Bernard Lyon 1) |
| مصطلحات موضوعية: | high-energy physics, proton-proton collisions, Higgs boson, CMS experiment, electromagnetic calorimeter (ECAL), radiative decays, photon energy scale, vectorlike top-partner, physique des hautes énergies, collisions proton-proton, boson de Higgs, expérience CMS, LHC, calorimètre électromagnétique (ECAL), photon, désintégrations radiatives, échelle d'énergie des photons, quark vecteur lourd, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] |
| الوصف: | The Large Hadron Collider (LHC) at CERN (European Organisation for Nuclear Research) has been in operation since 2009 at the border between France and Switzerland. This particle accelerator has provided a significant quantity of proton-proton collisions, at center of mass energies of 7 TeV (2010 and 2011) and 8 TeV (since April 2012). One of the purposes of the Compact Muon Solenoid (CMS) experiment, which records and analyses those collisions, is the search for Higgs bosons. In the Standard Model, this particle would be the quantum of the Higgs field, thought to explain the electroweak symmetry-breaking mechanism. One of the most sensitive channels for the search for a light Higgs boson (i.e. for masses between 90 GeV=c2 and 150 GeV=c2) at the LHC is through its decay into two photons. Indeed, the production of two highly energetic and isolated photons in the final state is a clean signal in hadronic collisions, despite the small branching ratio. Moreover, at these masses, the width of the reconstructed invariant mass peak is dominated by the detector resolution. Hence, a precise understanding of the photon object as reconstructed by the experiment is required. The first part of the work presented here is the study of radiative decays Z$^0 \rightarrow \mu\mu\gamma$ these decays are the only Standard Model source of high purity certified photons, for which the transverse momentum of the photon is relatively similar to the one of the photons coming from a Higgs boson decay. The study of these decays enables the determination of the differential photon energy scale in the 7 TeV data. These decays have also been used in the 8 TeV data as a validation tool of photon cluster shape variables in the simulation, and also as a way to determine the electron rejection criteria efficiency. The second part of the work concerns the search for a Higgs boson decaying into two photons. This search is done in several event classes in order to increase the sensitivity of the analysis, the study of the class separation procedure is ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| العلاقة: | tel-00914252; https://theses.hal.science/tel-00914252Test; https://theses.hal.science/tel-00914252/documentTest; https://theses.hal.science/tel-00914252/file/2013.12.01_OB_these_v28.pdfTest |
| الإتاحة: | https://theses.hal.science/tel-00914252Test https://theses.hal.science/tel-00914252/documentTest https://theses.hal.science/tel-00914252/file/2013.12.01_OB_these_v28.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.93077AFD |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |