Supersymmetric contributions to B_s→K^－π⁺decay

Abstract：

Recently, the CDF Collaboration has measured the branching fraction and time-integrated directCPasymmetry of B__s→K^－π⁺decay. The branching ratio is lower than the previous predictions based on QCD factorization. The experimental results favor a largeCPasymmetry in B_s→K^－π⁺decay while the standard model prediction is very small. We compute the supersymmetry contributions to B_s→K_－π⁺decay using the mass insertion method, and find that the LR and RL mass insertions could suppress this branching ratio and increase this directCPasymmetry well in line with the experimental data.