Inclusive and exclusive measurements of B decays to χ_c1 and
χ_c2 at Belle
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by
V. Bhardwaj, K. Miyabayashi, E. Panzenböck, K. Trabelsi, A. Frey, A.
Abdesselam, I. Adachi, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, H.
Atmacan (+179 others)
2016
Abstract
We report inclusive and exclusive measurements for χ_c1 and
χ_c2 production in B decays. We measure B(B →χ_c1
X)= (3.03 ± 0.05(stat) ± 0.24(syst)) × 10^-3 and
B(B →χ_c2 X)= (0.70 ± 0.06(stat) ±
0.10(syst)) × 10^-3. For the first time, χ_c2 production
in exclusive B decays in the modes B^0 →χ_c2π^- K^+ and B^+ →χ_c2π^+ π^- K^+ has been observed, along with first evidence for the
B^+ →χ_c2π^+ K_S^0 decay mode. For χ_c1 production, we
report the first observation in the B^+ →χ_c1π^+ π^- K^+, B^0
→χ_c1π^+ π^- K_S^0 and B^0 →χ_c1π^0 π^- K^+ decay
modes. Using these decay modes, we observe a difference in the production
mechanism of χ_c2 in comparison to χ_c1 in B decays. In
addition, we report searches for X(3872) and χ_c1(2P) in the B^+ →
(χ_c1π^+ π^-) K^+ decay mode. The reported results use 772 ×
10^6 BB events collected at the Υ(4S) resonance with
the Belle detector at the KEKB asymmetric-energy e^+e^- collider.
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