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We have performed a search for Bs-->mu+mu- and Bd-->mu+mu- decays in ppbarcollisions at sqrt(s) = 1.96TeV using 2fb-1 of integrated luminosity collectedby the CDF II detector at the Fermilab Tevatron Collider. The observed numberof Bs and Bd candidates is consistent with background expectations. Theresulting upper limits on the branching fractions are B(Bs-->mu+mu-) <5.8X10^-8 and B(Bd-->mu+mu-) < 1.8X10^-8 at 95% C.L.

Search for Bs --> mu+mu- and Bd --> mu+mu- Decays with 2fb-1 of ppbar Collisions