Search for the decays B0 d→μ+μ- and B0 s→μ+μ- in pp̄ collisions at √s=1.8 TeV

We present a search for the flavor-changing neutral current decays B{sub d}{sup 0}{yields}{mu}{sup +}{mu}{sup -} and B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -} in p{ovr p} collisions at sqrt[s] = 1.8 TeV, using 98 pp{sup -1} of data collected at the Collider Detector at Fermilab. We find one candidate event for these decays, which is consistent with the background estimates, and set upper limits on the branching fractions of B(B{sub d}{sup 0}{yields}{mu}{sup +}{mu}{sup -})<8.6 x 10{sup -7} and B(B{sub s}{sup 0}{yields}{mu}{sup +}{mu}{sup -}) < 2.6 x 10{sup -6} at 95% confidence level.