Abstract : A search has been performed for Bs0→μ+μ- and B0→μ+μ- decays using 7fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. The observed number of B0 candidates is consistent with background-only expectations and yields an upper limit on the branching fraction of B(B0→μ+μ-)<6.0×10-9 at 95% confidence level. We observe an excess of Bs0 candidates. The probability that the background processes alone could produce such an excess or larger is 0.27%. The probability that the combination of background and the expected standard model rate of Bs0→μ+μ- could produce such an excess or larger is 1.9%. These data are used to determine B(Bs0→μ+μ-)=(1.8-0.9+1.1)×10-8 and provide an upper limit of B(Bs0→μ+μ-)<4.0×10-8 at 95% confidence level.
T. Aaltonen, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, et al.. Search for Bs0→μ+μ- and B0→μ+μ- Decays with CDF II. Physical Review Letters, American Physical Society, 2011, 107, pp.191801. <10.1103/PhysRevLett.107.191801>. <in2p3-00618367>