Abstract
In this paper, we study the extended Standard Model (SM) with an extra Higgs doublet and right-handed neutrinos. If the symmetry to distinguish the two Higgs doublets is not assigned, flavor changing neutral currents (FCNCs) involving the scalars are predicted even at the tree level. We investigate the constraints on the FCNCs at the one-loop level, and especially study the semileptonic B meson decays, e.g. B → D(∗)τ ν and B → K(∗)ll processes, where the SM predictions are more than 2σ away from the experimental results. We also consider the flavor-violating couplings involving right-handed neutrinos and discuss if the parameters to explain the excesses of the semileptonic B decays can resolve the discrepancy in the anomalous muon magnetic moment. Based on the analysis, we propose the smoking-gun signals of our model at the LHC.
Highlights
To avoid the inconsistency with the anomaly-free conditions
In this paper, we study the extended Standard Model (SM) with an extra Higgs doublet and right-handed neutrinos
We investigate the constraints on the flavor changing neutral currents (FCNCs) at the one-loop level, and especially study the semileptonic B meson decays, e.g. B → D(∗)τ ν and B → K(∗)ll processes, where the SM predictions are more than 2σ away from the experimental results
Summary
We introduce the Type-III 2HDM with right-handed neutrinos. There are two Higgs doublets in our model. MH , mA and mH+ denote the masses of the heavy CP-even, CP-odd and charged Higgs scalars. We consider the contribution of ρν to flavor physics This investigation has not been done well in the type-III 2HDM. This is because the tiny Dirac neutrino masses predict small Yukawa couplings so that ρν is naively expected to be small. The unique texture as in eq (2.7) may allow ρν to be sizable Based on this consideration, we study the upper bound on ρν and discuss the impact on the physical observables in flavor physics
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