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 ${\cal B}(h\to\mu\tau)\sim1\%$ 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.
Highlights
The ongoing measurements on the 125 GeV Higgs boson, h, at the Large Hadron Collider (LHC) have begun to probe directly its Yukawa interactions with fermions [1,2,3,4,5,6]
We look at constraints on the resulting flavor-changing Higgs couplings to quarks and leptons, focusing on the former, as the leptonic case has been treated in detail in Ref. [57] which shows that the CMS h → μτ signal interpretation can be explained under the minimal flavor violation (MFV) assumption provided that the right-handed neutrinos couple to the Higgs in some nontrivial way
If the predictions disagree with the collected data, more complicated cases could be proposed in order to probe further the grand unified theory (GUT) MFV framework that we have investigated
Summary
The ongoing measurements on the 125 GeV Higgs boson, h, at the Large Hadron Collider (LHC) have begun to probe directly its Yukawa interactions with fermions [1,2,3,4,5,6]. To establish the link between the lepton and quark interactions beyond the SM, we consider the implementation of MFV in a grand unified theory (GUT) framework [88] with SU(5) as the unifying gauge group [91,92].3. In this GUT scheme, there are mass relations between the SM charged leptons and downtype quarks, and so we will deal with only the Higgs couplings to these fermions.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
