Lifetime difference in B_s mixing: Standard Model and beyond

Abstract

We present a calculation of $1/m_b^2$ corrections to the lifetime differences of $B_s$ mesons in the heavy-quark expansion. We find that they are small to significantly affect $\Delta \Gamma$ $(B_s)$ and present the result for lifetime difference including non-perturbative $1/m_b$ and $1/m_b^2$ corrections. We also analyze the generic $\Delta B$ = 1 New Physics contributions to the lifetime difference of $B_s$ mesons and provide several examples

Comments: 7 pages, 5 figures. To be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726. Presented by Andriy Badin at APS DPF 2009 meeting