Study of χc1 and χc2 meson production in B meson decays

Document Type


Publication Date



Using a sample of 9.7×10 BB̄ meson pairs collected with the CLEO detector, we study B decays to the χ and X charmonia states, which are reconstructed via their radiative decays to J/ψ. We first measure the branching fraction for inclusive χ production in B decays to be B(B→χ X) = (4.14±0.31±0.40)× 10 , where the first uncertainty is statistical and the second one is systematic. We derive the branching fractions for direct χ and χ production in B decays by subtracting the known contribution of the decay chain B →ψ(2S)X with ψ(2S)→χ γ. We obtain B[B→χ (direct)x] = (3.83±0.31±0.40)× 10 . No statistically significant signal for χ production is observed in either case. Using the Feldman-Cousins approach, we determine the 95% confidence intervals to be [0.2, 2.0] × 10 for B(B→χ X), [0.0, 1.7]× 10 for B[B →χ (direct)X], and [0.00, 0.44] for the ratio Γ[B→χ (direct)X]/Γ[B→χ (direct)X]. We also measure the branching ratio Γ[B→χ (direct)X ]/Γ[B→χ (direct)X ] for different X configurations by reconstructing B decays into exclusive final states with J/ψ, γ, a kaon, and up to four pions. For all the X configurations, we observe a strong χ signal yet no statistically significant χ signal. We discuss how our results compare with theoretical predictions in different models of charmonium production. © 2001 The American Physical Society. 6 -3 -3 -3 -3 c1 c2 c1 c1 c1 c2 c1, 2 c1 c2 c2 c2 c2 c1 c2 s c1 s s s c1 c2

Publication Name

Physical Review D

Volume Number


Issue Number






This document is currently not available here.