## 抄録

Using a sample of 9.7×10^{6} BB̄ meson pairs collected with the CLEO detector, we study B decays to the χ_{c1} and X_{c2} charmonia states, which are reconstructed via their radiative decays to J/ψ. We first measure the branching fraction for inclusive χ_{c1} production in B decays to be B(B→χ_{c1}X) = (4.14±0.31±0.40)× 10^{-3}, where the first uncertainty is statistical and the second one is systematic. We derive the branching fractions for direct χ_{c1} and χ_{c2} production in B decays by subtracting the known contribution of the decay chain B →ψ(2S)X with ψ(2S)→χ_{c1, 2}γ. We obtain B[B→χ_{c1}(direct)x] = (3.83±0.31±0.40)× 10^{-3}. No statistically significant signal for χ_{c2} production is observed in either case. Using the Feldman-Cousins approach, we determine the 95% confidence intervals to be [0.2, 2.0] × 10^{-3} for B(B→χ_{c2}X), [0.0, 1.7]× 10^{-3} for B[B →χ_{c2}(direct)X], and [0.00, 0.44] for the ratio Γ[B→χ_{c2}(direct)X]/Γ[B→χ _{c1}(direct)X]. We also measure the branching ratio Γ[B→χ_{c2}(direct)X _{s}]/Γ[B→χ_{c1}(direct)X_{s}] for different X_{s} configurations by reconstructing B decays into exclusive final states with J/ψ, γ, a kaon, and up to four pions. For all the X_{s} configurations, we observe a strong χ_{c1} signal yet no statistically significant χ_{c2} signal. We discuss how our results compare with theoretical predictions in different models of charmonium production.

本文言語 | English |
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論文番号 | 031102 |

ジャーナル | Physical Review D |

巻 | 63 |

号 | 3 |

DOI | |

出版ステータス | Published - 2001 |

## ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)