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Search For Anomalous Gauge Coupling through Vector Boson Scattering and Development of the GEM Detectors at the CMS Experiment
In the Standard Model (SM) of particle physics, masses of the particles are generated by the Higgs mechanism which requires the existence of a spin-0 particle called the Higgs boson. In July 2012, a new Higgs-like particle, with mass ≈125 GeV, was discovered at the Large Hadron Collider (LHC). This might be the long-sought SM Higgs boson predicted in the 1960s or one of the Higgs bosons predicted by the several beyond SM (BSM) scenarios. Several BSM scenarios, such as super-symmetry, little-Higgs models, and others from the extended Higgs sectors such as the Georgi- Machacek model, contain a multitude of neutral as well as charged Higgs bosons. Till now the existing results contain large uncertainties, thus various extensions of the SM cannot be confirmed or ruled out precisely. This necessitates to scrutinize, the ElectroWeak Symmetry Breaking (EWSB) mechanism rigorously by carrying out the precision measurements of the Higgs boson properties and the couplings of the electroweak vector bosons (W and Z) with the Higgs boson via the Vector Boson Scattering (VBS) processes. VBS study motivates me as it violates the unitarity in ~TeV region without Higgs. Due to statistical constraints, VBS could be probed indirectly by measuring the quartic vertices. In this talk, I will report my study of the anomalous Quartic Gauge Coupling (aQGC) processes using the proton-proton collision data at a centre-of-mass energy of 13 TeV with an integrated luminosity of 35.9 fb−1, collected using the Compact Muon Solenoid (CMS) detector at the CERN LHC in 2016.
Also, I will report my hardware related studies, that performed for the upgrade studies of the CMS detector’s muon endcap. For the CMS muon endcap detector system upgrade, the Gas Electron Multiplier (GEM) detectors are proposed to be installed during the Long Shutdown-2 (2019-2020) period. To test the functionality of these GEM detectors, several beam tests were carried out in 2014, to measure their properties and evaluate their performance in terms of spatial and timing resolution, cluster size and efficiency measurements. The outcome from these beam test campaigns and the data analysis for the GEM detectors will be presented. Also, the characterisation studies for the GEM foils developed in India for the first time will be described in terms of its electrical and optical properties.