A new particle was discovered by ATLAS and CMS experiments at the LHC in 2012. So far, the measurements of the couplings and properties of this particle show compatibility with the Standard Model (SM) within the experimental uncertainties. However, the existence of Beyond the Standard Model (BSM) exotic decays of this particle into light pseudoscalar particles which might have eluded our detection so far are not yet fully excluded. To explore such possibilities, I will present one of the search results from the CMS where the Higgs boson is expected to decay to pair of light pseudoscalars that finally decay into a pair of b-quarks and a pair of muons.
Since a successful physics program can only be achieved with sufficient understanding and optimization of the detector performance, therefore, I will also cover the muon endcap upgrade of the CMS experiment using Gas Electron Multiplier (GEM) technology. The use of such chambers in the CMS, in turn, could offer enhanced tracking and triggering capabilities for the muon system and are suited for stable, long-term operation in high rate environments such as the HL-LHC. Specifically, the talk will present the performance measurements such as gain, efficiency, rate capability, discharge probability, spatial and timing resolutions of these chambers estimated during the intensive R&D program and beam tests at CERN. The current status of the CMS muon endcap upgrade project will also be presented.
Further, a brief R&D program, and the development of first Indian GEM foils and its expected use in the the future high energy physics experiments especially in the CMS will also be covered.