Large h→bs in generic two-Higgs-doublet models

Abstract

We investigate the possible size of h → bs in two-Higgs-doublet models with generic Yukawa couplings. Even though the corresponding rates are in general expected to be small due to the indirect constraints from Bs → µ + µ − and Bs-Bs mixing, we find regions in parameter space where h → bs can have a sizable branching ratio well above 10%. This requires a tuning of the neutral scalar masses and their couplings to muons, but then all additional constraints such as B → Xsγ, (g − 2)µ, and h → µ + µ − are satisfied. In this case, h → bs can be a relevant background in h → bb searches and vice versa due to the imperfect b-tagging purity. Furthermore, if h → bs is sizeable, one expects two more scalar resonances in the proximity of m h . We briefly comment on other flavour violating Higgs decays and on the 95 GeV γγ resonance within generic two-Higgs-doublet models.1 Similar analyses were performed in the MSSM [8][9][10], also with additional vector-like fermions [11] and in 2HDMs with of type I and II [12], in aligned 2HDMs [13] as well as in Branco-Grimus-Lavoura [14] 2HDMs [15] and Zee models [16]. The correlations between h → bs and Bs → µ + µ − were considered in Ref. [17].

Let there be light from a second light Higgs doublet

“…We thank Andreas Crivellin for enlightening conversations during the preparation of this article, including discussions concerning his recent paper [77], and for useful comments on the manuscript. We are also grateful to Martin Bauer for interesting discussions concerning electroweak precision measurements and his encouragement, and would like to thank Fady Bishara for help with ROOT as well as Chris Hays and Mika Vesterinen for useful communications concerning lepton non-universality in W decays.…”

Light signals from a lighter Higgs

“…The overall rate is consistent with a production cross section σ pp→H BR H→γγ 0.1 pb, which is similar to the SM rate expected at that mass. This excess has already drawn attention [2,3]. Of course, we know from LEP that no SM-like Higgs boson exists at that mass [4].…”

Probing SUSY effects in K0 S → μ+μ−

“…5 Our result agrees with refs. [45][46][47][48]. However, it disagrees with notable literature [6,25] after discarding the long-distance contributions.…”