New Contributions to $b\to s\gamma$ in Minimal G2HDM

Abstract

We study the flavor-changing bottom quark radiative decay $b\to s\gamma$ induced at one-loop level within the minimal gauged two-Higgs-doublet model (G2HDM). Among the three new contributions to this rare process in G2HDM, we find that only the charged Higgs ${\mathcal{H}}^{\pm }$ contribution can be constrained by the current global fit data in $B$-physics. Other two contributions from the complex vectorial dark matter $\mathcal{W}$ and dark Higgs $\mathcal{D}$ are not sensitive to the current data. Combining with theoretical constraints imposed on the scalar potential and electroweak precision data for the oblique parameters, we exclude mass regions $m_{{\mathcal{H}}^{\pm }}\lesssim 250$ GeV and $m_{\mathcal{D}}\lesssim 100$ GeV at the 95\% confidence level.

35 pages, 8 figures

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