Model building for flavor changing Higgs couplings

Abstract

If $t\to hq$ ($q=c,u$) or $h\to \tau \ell$ ($\ell =\mu ,e$) decays are observed, it will be a clear signal of new physics. We investigate whether natural and viable flavor models can saturate the present direct upper bounds without violating the indirect constraints from low energy loop processes. We carry out our analysis in two theoretical frameworks: minimal flavor violation (MFV) and Froggatt-Nielsen symmetry (FN). The simplest models in either framework predict flavor changing couplings that are too small to be directly observed. Yet, in the MFV framework, it is possible to have lepton flavor changing Higgs couplings close to the bound if spurions related to heavy singlet neutrinos play a role. In the FN framework, it is possible to have large flavor changing couplings in both the up and the charged lepton sectors if supersymmetry plays a role.

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Cited by in corpus (9)

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• Addressing the LHC flavour anomalies with horizontal gauge symmetries
• Higgs $\to \mu \tau$ in Abelian and Non-Abelian Flavor Symmetry Models
• Higgs $\to$ $\mu \tau$ as an indication for $S_4$ flavor symmetry
• Rare Top-quark Decays to Higgs boson in MSSM
• Phenomenology of Enhanced Light Quark Yukawa Couplings and the $W^{\pm }h$ Charge Asymmetry
• Higgs boson decays with lepton flavor violation in the $B-L$ symmetric SSM
• Probing chirality structure in lepton-flavour-violating Higgs decay $h\to \tau \mu$ at the LHC
• Explaining the LHC flavour anomalies