Rare beauty and charm decays with the CMS experiment
National Taiwan University, Taipei, Taiwan
a e-mail: Kai-Feng.Chen@cern.ch
Rare beauty meson decays Bs0 → µ+µ−, B0 → μ+μ−, and charm meson decays D0 → μ+μ− are searched in pp collisions at √s = 7 TeV. A data sample corresponding to an integrated luminosity of 5 fb−1 collected by the CMS experiment is used for the B → μ+μ− study, while the data sample used for D0 → μ+μ− search is 90 pb−1. The number of events observed after applying the full selection criteria is consistent with the expectations from the sum of background and standard model signal. The resulting upper limits on the branching fractions are ℬ(Bs0 → µ+µ−) < 7.7 × 10−9, ℬ(B0 µ+ µ−) < 1.8 × 10−9 at 95% confidence level, and ℬ(D0 → μ+μ−) < 5.4 × 10−7 at 90% confidence level.
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