A search has been performed for B(s)0→μ+μ- and B0→μ+μ-
decays using 7 fb-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 B(s)0 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 B(s)0→μ+μ-
could produce such an excess or larger is 1.9%. These data are used to
determine B(B(s)0→μ+μ-)= (1.8-0.9+1.1)×10-8 and provide an upper
limit of B(B(s)0→μ+μ-)<4.0×10-8 at 95% confidence level.
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Updated: Thursday, 2012 January 26 15:45:43 CST automatically from input from "Stephanie A. Schuler"