# SUSY 2015, 23rd International Conference on Supersymmetry and Unification of Fundamental Interactions

23-29 August 2015
Lake Tahoe
US/Pacific timezone

## Enhancement of Br($B_d \to \mu^+\mu^-$)/Br($B_s \to \mu^+\mu^-$) in supersymmetric unified models

24 Aug 2015, 17:20
25m
Aspen ()

### Aspen

Flavor Violation Theory and Experiment

### Speaker

Dr Yukihiro Mimura (National Taiwan University)

### Description

The recent measurement of the branching fractions of the rare B meson decays, $B_d^0 \to \mu^+\mu^-$ and $B_s^0 \to \mu^+\mu^-$, is one of the most impressive achievements of the LHC experiments. The ratio of the branching fractions is about 2 sigma above the standard model prediction. Although the deviation is not very significant in the current statistical status, it is interesting to study a new physics model in which Br($B_d \to \mu^+\mu^-$) is enhanced naturally but not Br($B_s \to \mu^+\mu^-$) since in popular models to generate the new flavor violation the excess of $B_s \to \mu^+\mu^-$ decay is also generated. In this talk, we suggest an anti-symmetric coupling as a new source of flavor violation which can naturally explain the enhancement of the ratio, and study its implication in the framework of supersymmetric unified models, such as SU(5) and SO(10). The allowed parameter space is typically represented by pseudoscalar Higgs mass $m_A < 1$ TeV and $\tan\beta \,(=v_u/v_d) \sim 20$ for squark and gluino masses around 2 TeV. [This talk is based on the paper arXiv:1501.02044, published in PRD]

### Primary author

Dr Yukihiro Mimura (National Taiwan University)

### Co-author

Prof. Bhaskar Dutta (Texas A&M University)

### Presentation Materials

 SUSY2015-1.pdf SUSY2015-1.pptx