Possible extensions of the Standard Model predict the presence of multiple Higgs bosons. For example, the two-Higgs Doublet Model requires an additional SU(2)L complex doublet in the Lagrangian. Due to spontaneous symmetry breaking, the three degrees of freedom out of a total of eight are consumed to make the three gauge bosons (W± and Z0) massive. The remaining five degrees of freedom emerge as scalar Higgs bosons with two neutral CP-even scalars (H, h), one neutral CP-odd pseudoscalar (A), and two charged scalars (H±). We are looking for H± bosons in the top-quark pair production, where one top quark decays to a charged Higgs boson and a bottom quark, and the other to a W boson and a bottom quark. The charged Higgs boson further decays into a charm and a strange quark, and the W boson decays to a lepton (electron or muon) and a neutrino. The final state thus comprises an isolated high-momentum lepton, missing transverse momentum due to the escaping neutrino, and at least four jets, of which two are b-tagged. The search is conducted for an H+ mass ranging from 80 to 160 GeV. We have set up the analysis framework for the Ultra-legacy data sample that corresponds to an integrated luminosity of 137 fb−1, and are now validating the framework. I will report on the current status of this study.
Our group has initiated a new forum under “HGCAL GEANT activity” to explore the GEANT4 and geometry related issues for the High Granularity CALorimeter (HGCAL) under the aegis of HGCAL Detector Performance Group. We have developed a novel Muon Tomography method to identify several issues with the HGCAL geometry and energy response. The key findings of our Muon Tomography study have recently been integrated into the CMS software framework. In the second part of the seminar, I will discuss the application of Muon Tomography to validate the HGCAL geometry.
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