Study of χc1 and χc2 meson production in B meson decays

S. Chen, J. Fast, J. W. Hinson, J. Lee, D. H. Miller, E. I. Shibata, I. P.J. Shipsey, V. Pavlunin, D. Cronin-Hennessy, A. L. Lyon, E. H. Thorndike, V. Savinov, T. E. Coan, V. Fadeyev, Y. S. Gao, Y. Maravin, I. Narsky, R. Stroynowski, J. Ye, T. WlodekM. Artuso, R. Ayad, C. Boulahouache, K. Bukin, E. Dambasuren, S. Karamov, G. Majumder, G. C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, J. C. Wang, A. Wolf, J. Wu, S. Kopp, M. Kostin, A. H. Mahmood, S. E. Csorna, I. Danko, K. W. McLean, Z. Xu, R. Godang, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, G. J. Zhou, E. Lipeles, S. P. Pappas, M. Schmidtler, A. Shapiro, W. M. Sun, A. J. Weinstein, F. Würthwein, D. E. Jaffe, G. Masek, H. P. Paar, E. M. Potter, S. Prell, D. M. Asner, A. Eppich, T. S. Hill, R. J. Morrison, R. A. Briere, G. P. Chen, A. Gritsan, J. P. Alexander, R. Baker, C. Bebek, B. E. Berger, K. Berkelman, F. Blanc, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, A. D. Foland, P. Gaidarev, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, P. I. Hopman, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, M. Lohner, A. Magerkurth, T. O. Meyer, N. B. Mistry, E. Nordberg, M. Palmer, J. R. Patterson, D. Peterson, D. Riley, A. Romano, J. G. Thayer, D. Urner, B. Valant-Spaight, G. Viehhauser, A. Warburton, P. Avery, C. Prescott, A. I. Rubiera, H. Stoeck, J. Yelton, G. Brandenburg, A. Ershov, D. Y.J. Kim, R. Wilson, H. Yamamoto, T. Bergfeld, B. I. Eisenstein, J. Ernst, G. E. Gladding, G. D. Gollin, R. M. Hans, E. Johnson, I. Karliner, M. A. Marsh, C. Plager, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, R. Janicek, P. M. Patel, A. J. Sadoff, R. Ammar, A. Bean, D. Besson, X. Zhao, S. Anderson, V. V. Frolov, Y. Kubota, S. J. Lee, R. Mahapatra, J. J. O’Neill, R. Poling, T. Riehle, A. Smith, C. J. Stepaniak, J. Urheim, S. Ahmed, M. S. Alam, S. B. Athar, L. Jian, L. Ling, M. Saleem, S. Timm, F. Wappler, A. Anastassov, E. Eckhart, K. K. Gan, C. Gwon, T. Hart, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. K. Pedlar, H. Schwarthoff, J. B. Thayer, E. von Toerne, M. M. Zoeller, S. J. Richichi, H. Severini, P. Skubic, A. Undrus

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12 Scopus citations


Using a sample of 9.7×106 BB̄ meson pairs collected with the CLEO detector, we study B decays to the χc1 and Xc2 charmonia states, which are reconstructed via their radiative decays to J/ψ. We first measure the branching fraction for inclusive χc1 production in B decays to be B(B→χc1X) = (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 χc1 and χc2 production in B decays by subtracting the known contribution of the decay chain B →ψ(2S)X with ψ(2S)→χc1, 2γ. We obtain B[B→χc1(direct)x] = (3.83±0.31±0.40)× 10-3. No statistically significant signal for χc2 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→χc2X), [0.0, 1.7]× 10-3 for B[B →χc2(direct)X], and [0.00, 0.44] for the ratio Γ[B→χc2(direct)X]/Γ[B→χ c1(direct)X]. We also measure the branching ratio Γ[B→χc2(direct)X s]/Γ[B→χc1(direct)Xs] for different Xs configurations by reconstructing B decays into exclusive final states with J/ψ, γ, a kaon, and up to four pions. For all the Xs configurations, we observe a strong χc1 signal yet no statistically significant χc2 signal. We discuss how our results compare with theoretical predictions in different models of charmonium production.

Original languageEnglish (US)
Article number031102
Number of pages1
JournalPhysical Review D
Issue number3
StatePublished - Jan 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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