Investigation of the radiative decay $b \to s \gamma$ in the 3-4-1-1 model

Abstract

We investigate the branching ratio of the radiative decay $b\to s \gamma$ in the 3-4-1-1 model with arbitrary charge parameters $p,q$. We show that the new Higgs bosons, $\mathcal{H}_1^\pm$, and the new gauge bosons $W_{13,14 }^{\pm p,q}, Z_{2,3}$ contribute to this decay. Of these sources, the main contribution comes from the interaction of the singly-charged Higgs boson. If the spontaneous breaking of the enlarged gauge group symmetry down to the electroweak group is around a few TeVs, the predictions for the branching ratio Br($b\to s \gamma$) and meson mixing are both consistent with experimental constraints.