Abstract:
We report on a search for B0s-->µ+µ- and B0d-->µ+µ-
decays in pp-bar collisions at sqrt[s]=1.96 TeV using 171
pb-1 of data collected by the CDF II experiment at the
Fermilab Tevatron Collider. The decay rates of these rare
processes are sensitive to contributions from physics
beyond the standard model. One event survives all our
selection requirements, consistent with the background
expectation. We derive branching ratio limits of B(B0s--
>µ+µ-)<5.8 x 10-7 and B(B0d-->µ+µ-)<1.5 x 10-7 at
90% confidence level.