Speaker
Description
Recently, there has been great interest in beyond-the-Standard Model (BSM) physics involving new low-mass matter and mediator particles. One such model, $U(1)_{T3R}$, proposes a new U(1) gauge symmetry under which only right-handed fermions of the standard model are charged, as well as the addition of new vector-like fermions (e.g., $\chi_t$) and a new dark scalar particle ($\phi$) whose vacuum expectation value breaks the $U(1)_{T3R}$ symmetry. For this work, we perform a feasibility study to explore the mass ranges for which these new particles can be probed at the LHC. We consider the interaction $pp\rightarrow \chi_t t \phi$ in which the top quark decays purely hadronically, the $\chi_t$ decays semi-leptonically ($\chi_t\rightarrow W+b$), and the $\phi$ decays to two photons. The proposed search is expected to achieve a discovery reach with signal significance greater than $5\sigma$ for $\chi_t$ masses up to 1.8 TeV and $\phi$ masses as low as 1 MeV, assuming an integrated luminosity of 3000 fb$^{-1}$.
| Are you are a member of the APS Division of Particles and Fields? | No |
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