F. Abe et al., SEARCH FOR FLAVOR-CHANGING NEUTRAL-CURRENT B-MESON DECAYS IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8-TEV, Physical review letters, 76(25), 1996, pp. 4675-4680
We report on a search for the flavor-changing neutral current decays B
-d,s(0) --> mu(+)mu(-), B+ --> mu(+)mu(-)K(+), and B-0 --> mu(+)mu(-)K
(0) using data from <p(p)over bar> collisions at root s = 1.8 TeV, co
llected with the Collider Detector at Fermilab during the 1992-1993 ru
nning period. We find no indication of such decays, and we set the fol
lowing 90% confidence level upper limits on branching ratios: B(B-0 --
> mu(+)mu(-)) < 1.6 x 10(-6), B(B-s(0) --> mu(+)mu(-)) < 8.4 x 10(-6),
B(B+ --> mu(+)mu(-)K(+)) < 1.0 x 10(-5), and B(B-0 --> mu(+)mu(-)K(0
)) < 2.5 x 10(-5).