Speaker
Description
In this talk, we present a novel model that extends the standard model (SM) by introducing a $SU(2)_L$ singlet vectorlike quark (VLQ) charged under an additional local $U(1)_d$ symmetry group, along with the associated gauge boson, known as the dark photon. Owing to the additional $U(1)_d$ charge, the model predicts a suppressed branching ratio for the VLQ in the standard modes, leading to an intriguing possibility: its decay into a top quark and a dark photon/dark Higgs. This unique decay mode helps us to evade existing LHC bounds and at the same time offers an unexplored territory in the context of collider experiments. We conduct a comprehensive study of the collider signatures associated with the proposed model at the 13 and 14 TeV LHC center-of-mass energies. Specifically, we focus on the $t\bar{t}+missing ~transverse ~energy$ and $t+missing~transverse~energy$ signatures, which allow us to constrain the VLQ mass and its mixing angle with the top quark.
| You are | PhD student |
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