Suppression of the Higgs Dimuon Decay

Abstract

It is often stated that elimination of tree-level flavor-changing neutral currents in multi-Higgs models requires that all fermions of a given charge to couple to the same Higgs boson. A counterexample was provided by Abe, Sato and Yagyu in a muon-specific two-Higgs doublet model with a softly-broken $Z_4$ symmetry. In this model, all fermions except the muon couple to one Higgs and the muon couples to the other. We study the phenomenology of the model and show that there is a wide range of parameter-space in which the branching ratios of the 125 GeV Higgs are very close to their Standard Model values, with the exception of the branching ratio into muons, which can be substantially suppressed -- this is an interesting possibility, since the current value of this branching ratio is $0.5\pm 0.7$ times the Standard Model value. We also study the charged Higgs boson and show that, if it is lighter than $200$ GeV, it could have a large branching ratio into $\mu \nu$ - even substantially larger than the usual decay into $\tau \nu$. The decays of the heavy neutral scalars are also studied. The model does have a relationship between the branching ratios of the 125 GeV Higgs into $Z$'s, $\tau$'s and $\mu$'s, which can be tested in future accelerators.

DiHiggs section added

References in corpus (5)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Updated NNLO QCD predictions for the weak radiative B-meson decays
• SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM
• Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

Cited by in corpus (5)

• $(g-2{)}_{\mu }$ in the 2HDM and slightly beyond -- an updated view
• Flavor Changing Neutral Currents in the Higgs Sector
• Investigation of $(g-2{)}_{\mu }$ anomaly in the $\mu$-specific 2HDM with Vector like leptons and the phenomenological implications
• Muon Electric Dipole Moment as a Probe of Flavor-Diagonal CP Violation
• Lepton Flavor Specific Extended Higgs Model