Abstract
We present our results for the one-loop contributions to the Higgs boson flavor-changing decays h → μτ in two extensions of the Standard Model: the Little Higgs Model with T-parity and the Two Higgs Doublet Model with a fourth generation of fermions. In both cases we find that the respective branching ratio BR(h → μτ) is of order 10−4 – 10−6. In the case of the 4G2HDM, the one-loop radiative correction is of the same order of magnitude as the tree level branching ratio. We find that in both models the branching ratios for the decay modes h → eτ, eμ are even more suppressed.
Highlights
In the Standard Model (SM) the flavor-changing Higgs decays h → μτ, eτ and eμ are forbidden at tree level due to the Glashow-Iliopoulos-Maiani mechanism [1]
We present our results for the one-loop contributions to the Higgs boson flavorchanging decays h → μτ in two extensions of the Standard Model: the Little Higgs Model with T-parity and the Two Higgs Doublet Model with a fourth generation of fermions
In some extensions of the SM this branching ratio could be at the level of few percent, close to the upper limits included in the first reports of CMS and ATLAS [9,10,11]
Summary
In the Standard Model (SM) the flavor-changing Higgs decays h → μτ , eτ and eμ are forbidden at tree level due to the Glashow-Iliopoulos-Maiani mechanism [1]. The one-loop contributions to these decay channels in the SM with massive neutrinos are highly suppressed, of order 10−29 [2]. Due to this expectation, the excess reported by the CMS [3] and the ATLAS [4] Collaborations for the branching ratio BR(h → μτ ) stimulated great interest among theoreticians [7,8,9,10,11]. We mention the potential some results of two extensions of the SM; the Littlest Higgs Model with T-parity (LHM+T), and the Two Higgs doublet model with fourth family (4GTHDM). Our conclusions and outlook are presented in the section 3
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