Rare B decays to states containing a J/ꝟ meson

Abstract

Results are presented on preliminary measurements of the branching fractions for B+ → J/ꝟøK+, B0 → J/ꝟøK05, B0 → J/ꝟø, B0 → J/ꝟɳ and B0 → J/ꝟɳ' using 56 million BB events collected at the Y(4S) resonance with the BABAR detector at PEP-II. We measure branching fractions of B(B+ → J / vøK+)=(4.4 ± 1.4(stat) ± 0.5(syst)) x 10-5 and B(B0 → J/ꝟøK0S)=(5.1 ± 1.9(stat) ± 0.5(syst)) x 10-5, and set upper limits at 90% C.L. for branching fractions B(B0 → J/ꝟø) < 9.2 x 10-6. B(B0 → J/ꝟɳ) < 2.7 x 10-5,. and B(B0 → J/ꝟɳ') < 6.3 x 10-5.