We report on a search for bs-->m+m- and bd-->m+m-
decays using proton-antiproton collision data at sqrt(s) = 1.96 TeV
corresponding to 10 fb-1 of integrated luminosity collected by the CDF
detector at the Fermilab Tevatron collider. The observed number of bd
candidates is consistent with background-only expectations and yields an
upper limit on the branching fraction of br(bd-->m+m-) less than 4.6 x
10{-9} at 95% confidence level. We observe an excess of bs candidates.
The probability that the background processes alone could produce such
an excess or larger is 0.94%. The probability that the combination of
background and the expected standard model rate of bs-->m+-m could
produce such an excess or larger is 6.8%. These data are used to
determine a branching fraction br(bs-->m+m-) = (1.3{+0.9}_{-0.7})
times 10{-8} and provide an upper limit of br(bs-->m+m-) less than
3.1 times 10{-8} at 95% confidence level.
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Updated: Thursday, 2013 April 11 15:38:31 CDT automatically from input from Barbara Hehner