Search for rare B0(s)→μ+μ−μ+μ− decays
Résumé
A search for the decays B0s→μ+μ−μ+μ− and B0→μ+μ−μ+μ− is performed using data, corresponding to an integrated luminosity of 1.0\ensuremath{\{\,fb}^{-1}}\xspace, collected with the LHCb detector in 2011. The number of candidates observed is consistent with the expected background and, assuming phase-space models of the decays, limits on the branching fractions are set: \{\ensuremathB\xspace(B0s→μ+μ−μ+μ−)<1.6 (1.2)×10−8} and \{\ensuremathB\xspace(B0→μ+μ−μ+μ−)<6.6 (5.3)×10−9} at 95\,% (90\,%) confidence level. In addition, limits are set in the context of a supersymmetric model which allows for the B0(s) meson to decay into a scalar (S) and pseudoscalar particle (P), where S and P have masses of 2.5 GeV and 214.3 MeV, respectively, both resonances decay into μ+μ−. The branching fraction limits for these decays are \{\ensuremathB\xspace(\ensuremathB0s→SP\xspace)<1.6 (1.2)×10−8} and \{\ensuremathB\xspace(\ensuremathB0→SP\xspace)<6.3 (5.1)×10−9} at 95% (90%) confidence level.
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