Speaker
Description
A decade after the discovery of the Higgs boson by the ATLAS and CMS experiments at the LHC, along with the subsequent observation of ttH events and studies of Higgs decays into pairs of W/Z bosons and $\tau$ leptons, the search for physics beyond the Standard Model (BSM) continues to present significant challenges. Vector-like quarks (VLQs) are hypothetical spin-1/2 particles of a fourth generation, possessing both left- and right-handed components that transform identically under the $ SU(3)_C\times SU(2)_L\times U(1)_Y~$ symmetry group. These particles are central to various BSM models, which propose solutions to the hierarchy problem and Higgs mass stabilization while remaining consistent with Higgs cross-section measurements. This presentation will provide an overview of the current status of the search for VLQ particles, specifically (T$^\prime$) decaying into a top quark ($t\rightarrow Wb\rightarrow l\nu b$) and a Higgs boson($H\rightarrow WW^*\rightarrow 4q$) at the CMS experiment. Additionally, we will explore the use of jet substructure techniques for identifying Higgs decays, with a focus on a novel Higgs$\rightarrow4q$ tagger based on Deep Neural Network.
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