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The LHCb experiment has the potential, during the 2010-11 run, to observe, or improve significantly the exclusion bounds on, the rare decays B_s ->mu^+mu^- and D0 -> mu^+mu^-. These studies will provide very of New Physics effects. High sensitivity to New Physics contributions is also achieved by searching for direct CP violation in B0 -> K* gamma, performing a time dependent analysis of B_s --> phi gamma, and making an angular study of the decay B0 -> K* mu^+ mu^-. Here also significant results are expected from the present run. Preparations for these analyses will be presented, and studies shown of how existing data, for example prompt J/psi events, can be used to validate the analysis strategy.
Rare decays of beauty hadrons test the flavour structure of the Standard Model and of other theories at the level of quantum corrections. They provide information on the couplings and masses of heavy virtual particles appearing as intermediate states. A review of recent results from the the LHCb, ATLAS, and CMS collaborations on new physics searches in b -> s transitions will be presented.
Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are detected. Two structures are observed in the D0 K+ mass spectrum at masses consistent with the known D^+_{s1}(2536) and $D^{*+}_{s2}(2573) mesons. The measured branching fractions relative to the total Bs semileptonic rate are B(Bs -> D_{s2}^{*+} X mu nu)/B(Bs -> X mu nu)= (3.3\pm 1.0\pm 0.4)%, and B(Bs -> D_{s1}^+ X munu)/B(Bs -> X mu nu)= (5.4\pm 1.2\pm 0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D_{s2}^{*+} state in Bs decays; we also measure its mass and width.
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