Paper detail

Like-sign dimuon charge asymmetry in Randall-Sundurm model

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 $Γ_{12}^s$ 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 $ΔM_s$, $ΔΓ_s$ as well as $K$ mixing and electroweak corrections constrain it to be greater than a $σ$ 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 $Γ^s_{12}$, even though the model can generate large contribution to the mass difference $M^s_{12}$.