Constraining Higgs Couplings Using Bs→μμ Decay
Cheng-Wei Chiang1,2,3, Xiao-Gang He4,5,1,3, Fang Ye1, Xing-Bo Yuan3*
1Department of Physics, National Taiwan University, Taipei, Taiwan
2Institute of Physics, Academia Sinica, Taipei, Taiwan
3Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan
4T-D Lee Institute, Shanghai Jiao Tong University, Shanghai, China
5Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
* Presenter:Xing-Bo Yuan,
We study constraints and implications of the recent LHCb measurement of Bs→μμ for tree-level Higgs-mediated flavor-changing neutral current (FCNC) interactions. Combined with experimental data on Bs mass difference , the h→μτ, and the h→ττ decay branching ratios from the LHC, we find that the Higgs FCNC couplings are severely constrained. Current data allow large CP violation in the h→ττ decay. Consequences of the Cheng-Sher ansatz for the Higgs Yukawa couplings are discussed.

Keywords: FCNC, Higgs, rare decay, Physics Beyond the Standard Model