Like-sign dimuon charge asymmetry in Randall-Sundurm model

Abstract

We confirm that in order to account for the recent DØ\ result of large like-sign dimuon charge asymmetry, a considerable large new physics effect in ${\Gamma }_{12}^s$ is required in addition to a large CP violating phase in $B_s-{\bar{B}}_s$ mixing. In the Randall-Sundrum model of warped geometry, where the fermion fields reside in the bulk, new sources of flavor and CP violation are obtained. We analyze the like-sign dimuon asymmetry in this class of model, as an example of the desired new physics. We show that the wrong charge asymmetry, $a_{sl}^s$, which is related to the dimuon asymmetry, is significantly altered compared to the Standard Model value. However, experimental limits from $\Delta M_s$, $\Delta {\Gamma }_s$ as well as $K$ mixing and electroweak corrections constrain it to be greater than a $\sigma$ away from its experimental average value. This model cannot fully account for the DØ\ anomaly due to its inability to generate sufficient new contribution to the width difference ${\Gamma }_{12}^s$, even though the model can generate large contribution to the mass difference $M_{12}^s$.

Comments: 20 pages, 9 figures, discussions and references added, accepted for publication in Physical Review D