We report on a search for B0(s) --> mu+ mu- and B0(d) --> mu+
mu- decays in p anti-p collisions at s**(1/2) = 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(B0(s) --> mu+ mu-) < 5.8 x 10-7 and B(B0(d) -->
mu+ mu-) < 1.5 x 10-7 at 90% confidence level.
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Updated: Thursday, 2005 March 03 11:03:29 CST automatically from input from Carol Picciolo