Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-09-30
Physics
High Energy Physics
High Energy Physics - Experiment
10 pages, 8 figures, Refs. updated and Fig. 8a now improved colour coding, Published version in Phys. Lett. B with updated ref
Scientific paper
The pure leptonic decay B_s -> mu mu is strongly suppressed in the Standard Model (SM), but can have large enhancements in Supersymmetry, especially at large values of tanbe. New limits on this decay channel from recent LHC data have been used to claim that these limits restrict the SUSY parameter space even more than the direct searches. However, direct searches are hardly dependent on tanbe, while BR(B_s -> mu mu) is proportional to tanbe^6. The relic density constraint requires large tanbe in a large region of the parameter space, which can lead to large values of B_s -> mu mu. Nevertheless, the experimental upper limit on BR(B_s -> mu mu) is not constraining the parameter space of the CMSSM more than the direct searches and the present Higgs limits, if combined with the relic density. We also observe SUSY parameter regions with negative interferences, where the B_s -> mu mu value is up to a factor three below the SM expectation, even at large values of tanbe.
Beskidt Conny
Boer Wim de
Kazakov Dmitri I.
Ratnikov Fedor
Zhukov Valery
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