PNNL

Abstract

A search for the decays Bþ ? hcKþ and B0 ? hcK0S is performed. Evidence for the decay Bþ ? hcKþ is found; its significance is 4.8s. No evidence is found for B0 ? hcK0S. The branching fraction for Bþ ? hcKþ is measured to be ð3.7-þ01..90 -þ00..88Þ × 10-5; the upper limit for the B0 ? hcK0S branching fraction is 1.4 × 10-5 at 90% C.L. In addition, a study of the pp¯ pþp- invariant mass distribution in the channel Bþ ? ðpp¯ pþp-ÞKþ results in the first observation of the decay ?cð2SÞ ? p ¯ppþp- with 12.1s significance. The analysis is based on the 711 fb-1 data sample collected by the Belle detector at the asymmetric-energy eþe- collider KEKB at the ?ð4SÞ resonance.