Inclusive and exclusive measurements of $B$ decays to $\chi_c1$ and $\chi_c2$ at Belle

分类： 物理学 >> 核物理学 提交时间： 2016-09-12

Bhardwaj, V. and others

摘要： We report inclusive and exclusive measurements for χc1 and χc2 production in B decays. We measure B(B→χc1X)= (3.03±0.05(stat)±0.24(syst))×10−3 and B(B→χc2X)= (0.70±0.06(stat)±0.10(syst))×10−3. For the first time, χc2 production in exclusive B decays in the modes B0→χc2π−K+ and B+→χc2π+π−K+ has been observed, along with first evidence for the B+→χc2π+K0S decay mode. For χc1 production, we report the first observation in the B+→χc1π+π−K+, B0→χc1π+π−K0S and B0→χc1π0π−K+ decay modes. Using these decay modes, we observe a difference in the production mechanism of χc2 in comparison to χc1 in B decays. In addition, we report searches for X(3872) and χc1(2P) in the B+→(χc1π+π−)K+ decay mode. The reported results use 772×106 BB¯¯¯¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider.

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