Mixing asymmetries in B meson systems, the D0 like-sign dimuon asymmetry and generic New Physics

Abstract

The measurement of a large like-sign dimuon asymmetry $A_{SL}^b$ by the D0 experiment at the Tevatron departs noticeably from Standard Model expectations and it may be interpreted as a hint of physics beyond the Standard Model contributing to $\Delta B\ne 0$ transitions. In this work we analyse how the natural suppression of $A_{SL}^b$ in the SM can be circumvented by New Physics. We consider generic Standard Model extensions where the charged current mixing matrix is enlarged with respect to the usual $3\times 3$ unitary Cabibbo-Kobayashi-Maskawa matrix, and show how, within this framework, a significant enhancement over Standard Model expectations for $A_{SL}^b$ is easily reachable through enhancements of the semileptonic asymmetries $A_{SL}^d$ and $A_{SL}^s$ of both $B_d^0$ - ${\bar{B}}_d^0$ and $B_s^0$ - ${\bar{B}}_s^0$ systems. Despite being insufficient to reproduce the D0 measurement, such deviations from SM expectations may be probed by the LHCb experiment.

17 pages, 10 figures, 1 table. Improved sections 2 and 3, updated results, conclusions unchanged

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• A Supersymmetric Theory of Baryogenesis and Sterile Sneutrino Dark Matter from $B$ Mesons
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