Probing New Physics with $B_s^0\to {\mu }^{+}{\mu }^{-}$: Status and Perspectives

Abstract

The rare decay $B_s^0\to {\mu }^{+}{\mu }^{-}$ plays a key role for the testing of the Standard Model. It is pointed out that the sizable decay width difference $\Delta {\Gamma }_s$ of the $B_s$-meson system affects this channel in a subtle way. As a consequence, its calculated Standard Model branching ratio has to be upscaled by about 10%. Moreover, the sizable $\Delta {\Gamma }_s$ makes a new observable through the effective $B_s^0\to {\mu }^{+}{\mu }^{-}$ lifetime accessible, which probes New Physics in a way complementary to the branching ratio and adds an exciting new topic to the agenda for the high-luminosity upgrade of the LHC. Further probes of New Physics are offered by a CP-violating rate asymmetry. Correlations between these observables and the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching ratio are illustrated for specific models of New Physics.

arXiv comment14 pages, 6 figures, invited talk at the International Conference on Flavor Physics and Mass Generation, Singapore, 10-14 February 2014, to appear in the Proceedings

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