Constraints from the SM-like Higgs boson in a flavor-dependent $U(1)$ extension of the Standard Model

Abstract

This work presents a phenomenological study of the Standard Model-like Higgs boson $H$ in a flavor-dependent $U(1{)}_X$ extension of the Standard Model, where the $X$ charge is assigned according to fermion flavors. In particular, we analyze the interactions of $H$ with Standard Model particles as well as with new charged scalar bosons. In addition, the parameter ${\text{ka}}_{\text{ga}}$, which characterizes the $H\to \text{ga}\text{ga}$ decay at the one-loop level, is investigated. The results show that the model predicts ${\text{ka}}_{\text{ga}}$ values consistent with the ATLAS and CMS constraints at the $1\sigma$ level, while satisfying several bounds derived from flavor, collider and dark matter studies.

Comments: 13 pages, 2 figures