2015/11/30 by R. Benbrik, Chuan-Hung Chen, Takaaki Nomura · 34 citations
Computer Science · Physics and Astronomy · #Branching fraction #Computational Physics and Python Applications #Coupling (piping) #Higgs boson #Muon #Neutrino Physics Research #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Standard Model (mathematical formulation) #Tree (set theory) #Upper and lower bounds #Yukawa potential #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.93.095004
published in Physical review. D/Physical review. D. 93(9) (American Physical Society) · 23 pages, 16 figures, published version
openalex publication_date 2016/05/09 · openalex created_date 2016/06/24 · arxiv created 2016/07/25 · arxiv updated 2016/07/26 · openalex updated_date 2026/08/05
Inspired by a significance of 2.4\ensuremathσ for the h\ensuremath→\ensuremathμ\ensuremathτ decay observed by the CMS experiment at √(s)=8 TeV, we investigate the Higgs lepton-flavor-violating effects in a generic two-Higgs-doublet model (THDM), where the lepton-flavor-changing neutral currents are induced at the tree level and arise from the Yukawa sector. We revisit the constraints for generic THDM by considering theoretical requirements, precision measurements of \ensuremathδ\ensuremathρ and oblique parameters S, T, and U, and Higgs measurements. The bounds from Higgs data play the major limits. With parameter values that simultaneously satisfy the Higgs bounds and the CMS excess of the Higgs coupling to \ensuremathμ\ensuremath-\ensuremathτ, we find that the tree-level \ensuremathτ\ensuremath→3\ensuremathμ and the loop-induced \ensuremathτ\ensuremath→\ensuremathμ\ensuremathγ decays are consistent with current experimental upper limits; the discrepancy in muon g\ensuremath-2 between experimental results and standard model predictions can be resolved, and an interesting relation between muon g\ensuremath-2 and the branching ratio (BR) for \ensuremathμ\ensuremath→e\ensuremathγ is found. The generic THDM results show that the order of magnitude of the ratio BR(h\ensuremath→e\ensuremathτ)/BR(h\ensuremath→\ensuremathμ\ensuremathτ) is smaller than 10^\ensuremath-4. Additionally, we also study the rare decay Z\ensuremath→\ensuremathμ\ensuremathτ and get BR(Z\ensuremath→\ensuremathμ\ensuremathτ)<10^\ensuremath-6.