PNNL

Abstract

We report inclusive and exclusive measurements for ?c1 and ?c2 production in B decays. We measure B(B ? ?c1X)= (3.03 ± 0.05(stat) ± 0.24(syst)) × 10-3 and B(B ? ?c2X)= (0.70 ± 0.06(stat) ± 0.10(syst)) × 10-3 . For the first time, ?c2 production in exclusive B decays in the modes B 0 ? ?c2p -K+ and B + ? ?c2p +p -K+ has been observed, along with first evidence for the B + ? ?c2p +K0 S decay mode. For ?c1 production, we report the first observation in the B + ? ?c1p +p -K+, B 0 ? ?c1p +p -K0 S and B 0 ? ?c1p 0p -K+ decay modes. Using these decay modes, we observe a difference in the production mechanism of ?c2 in comparison to ?c1 in B decays. In addition, we report searches for X(3872) and ?c1(2P) in the B + ? (?c1p +p -)K+ decay 3 mode. The reported results use 772 × 106 BB events collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider.