Enhancement of Br(B_d -> mu^+mu^-)/Br(B_s -> mu^+mu^-) in Supersymmetric Unified Models

TL;DR

This paper explores how supersymmetric grand unified models with anti-symmetric couplings can explain deviations in B meson decay rates into muons, linking flavor violation, CP phases, and experimental constraints.

Contribution

It introduces a novel flavor violation source in supersymmetric GUT models and demonstrates its ability to account for observed B meson decay deviations.

Findings

Correlation between B_d -> mu^+mu^- decay and CP phase in B_d -> J/psi K decay.

Parameter space with pseudoscalar Higgs mass < 1 TeV and tan beta < 20.

Compatibility with constraints from rare decays, oscillations, and electric dipole moments.

Abstract

We explain the 2.3 sigma deviation in the recent measurements of the neutral B mesons decay into muon pairs from the standard model prediction in the framework of supersymmetric grand unified models using anti-symmetric coupling as a new source of flavor violation. We show a correlation between the B_d -> mu^+mu^- decay and the CP phase in the B_d -> J/psi K decay and that their deviations from the standard model predictions can be explained after satisfying constraints arising from various hadronic and leptonic rare decay processes, B-bar{B}, K-bar{K} oscillations data and electric dipole moments of electron and neutron. The allowed parameter space is typically represented by pseudoscalar Higgs mass m_A < 1 TeV and tan beta_H (= {v_u}/{v_d}) < 20 for squark and gluino masses around 2 TeV.