Flavor-Changing Higgs Decays in Grand Unification with Minimal Flavor Violation

Abstract

We consider the flavor-changing decays of the Higgs boson in a grand unified theory framework which is based on the SU(5) gauge group and implements the principle of minimal flavor violation. This allows us to explore the possibility of connecting the tentative hint of the Higgs decay $h\to \mu \tau$ recently reported in the CMS experiment to potential new physics in the quark sector. We look at different simple scenarios with minimal flavor violation in this context and how they are subject to various empirical restrictions. In one specific case, the relative strengths of the flavor-changing leptonic Higgs couplings are determined mainly by the known quark mixing parameters and masses, and a branching fraction $\mathcal{B}(h\to \mu \tau )\sim 1\%$ is achievable without the couplings being incompatible with the relevant constraints. Upcoming data on the Higgs leptonic decays and searches for the $\mu \to e\gamma$ decay with improved precision can offer further tests on this scenario.

18 pages, 2 figures, somewhat expanded, references added, main conclusions unchanged, matches published version

References in corpus (18)

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• Updated fit to three neutrino mixing: status of leptonic CP violation
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• Minimal flavour violation extensions of the seesaw
• Higgs $\to$ $\mu \tau$ as an indication for $S_4$ flavor symmetry
• Grand Unification and the Principle of Minimal Flavor Violation
• Model building for flavor changing Higgs couplings
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Cited by in corpus (6)

• Higgs lepton flavor violating decays in Two Higgs Doublet Models
• Flavor techniques for LFV processes: Higgs decays in a general seesaw model
• Higgs boson decays with lepton flavor violation in the $B-L$ symmetric SSM
• Flavor Changing Neutral Currents in the Higgs Sector
• Searching for BSM Physics in Yukawa Couplings and Flavour Symmetries
• Flavor violating leptonic decays of the Higgs boson