Phys. Rev. D
63,
031102(R)
(2001)
[6 pages]
Study of χc1 and χc2 meson production in B meson decays
S. Chen et al. (CLEO Collaboration)
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S. Chen1, J. Fast1, J. W. Hinson1, J. Lee1, D. H. Miller1, E. I. Shibata1, I. P. J. Shipsey1, V. Pavlunin1, D. Cronin-Hennessy2, A. L. Lyon2, E. H. Thorndike2, V. Savinov3, T. E. Coan4, V. Fadeyev4, Y. S. Gao4, Y. Maravin4, I. Narsky4, R. Stroynowski4, J. Ye4, T. Wlodek4, M. Artuso5, R. Ayad5, C. Boulahouache5, K. Bukin5, E. Dambasuren5, S. Karamov5, G. Majumder5, G. C. Moneti5, R. Mountain5, S. Schuh5, T. Skwarnicki5, S. Stone5, J. C. Wang5, A. Wolf5, J. Wu5, S. Kopp6, M. Kostin6, A. H. Mahmood7, S. E. Csorna8, I. Danko8, K. W. McLean8, Z. Xu8, R. Godang9, G. Bonvicini10, D. Cinabro10, M. Dubrovin10, S. McGee10, G. J. Zhou10, E. Lipeles11, S. P. Pappas11, M. Schmidtler11, A. Shapiro11, W. M. Sun11, A. J. Weinstein11, F. Würthwein11,*, D. E. Jaffe12, G. Masek12, H. P. Paar12, E. M. Potter12, S. Prell12, D. M. Asner13, A. Eppich13, T. S. Hill13, R. J. Morrison13, R. A. Briere14, G. P. Chen14, A. Gritsan15, J. P. Alexander16, R. Baker16, C. Bebek16, B. E. Berger16, K. Berkelman16, F. Blanc16, V. Boisvert16, D. G. Cassel16, P. S. Drell16, J. E. Duboscq16, K. M. Ecklund16, R. Ehrlich16, A. D. Foland16, P. Gaidarev16, L. Gibbons16, B. Gittelman16, S. W. Gray16, D. L. Hartill16, B. K. Heltsley16, P. I. Hopman16, L. Hsu16, C. D. Jones16, J. Kandaswamy16, D. L. Kreinick16, M. Lohner16, A. Magerkurth16, T. O. Meyer16, N. B. Mistry16, E. Nordberg16, M. Palmer16, J. R. Patterson16, D. Peterson16, D. Riley16, A. Romano16, J. G. Thayer16, D. Urner16, B. Valant-Spaight16, G. Viehhauser16, A. Warburton16, P. Avery17, C. Prescott17, A. I. Rubiera17, H. Stoeck17, J. Yelton17, G. Brandenburg18, A. Ershov18, D. Y.-J. Kim18, R. Wilson18, H. Yamamoto19, T. Bergfeld20, B. I. Eisenstein20, J. Ernst20, G. E. Gladding20, G. D. Gollin20, R. M. Hans20, E. Johnson20, I. Karliner20, M. A. Marsh20, C. Plager20, C. Sedlack20, M. Selen20, J. J. Thaler20, J. Williams20, K. W. Edwards21, R. Janicek22, P. M. Patel22, A. J. Sadoff23, R. Ammar24, A. Bean24, D. Besson24, X. Zhao24, S. Anderson25, V. V. Frolov25, Y. Kubota25, S. J. Lee25, R. Mahapatra25, J. J. O’Neill25, R. Poling25, T. Riehle25, A. Smith25, C. J. Stepaniak25, J. Urheim25, S. Ahmed26, M. S. Alam26, S. B. Athar26, L. Jian26, L. Ling26, M. Saleem26, S. Timm26, F. Wappler26, A. Anastassov27, E. Eckhart27, K. K. Gan27, C. Gwon27, T. Hart27, K. Honscheid27, D. Hufnagel27, H. Kagan27, R. Kass27, T. K. Pedlar27, H. Schwarthoff27, J. B. Thayer27, E. von Toerne27, M. M. Zoeller27, S. J. Richichi28, H. Severini28, P. Skubic28, and A. Undrus28 (CLEO Collaboration)
1Purdue University, West Lafayette, Indiana 47907
2University of Rochester, Rochester, New York 14627
3Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
4Southern Methodist University, Dallas, Texas 75275
5Syracuse University, Syracuse, New York 13244
6University of Texas, Austin, Texas 78712
7University of Texas - Pan American, Edinburg, Texas 78539
8Vanderbilt University, Nashville, Tennessee 37235
9Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
10Wayne State University, Detroit, Michigan 48202
11California Institute of Technology, Pasadena, California 91125
12University of California, San Diego, La Jolla, California 92093
13University of California, Santa Barbara, California 93106
14Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
15University of Colorado, Boulder, Colorado 80309-0390
16Cornell University, Ithaca, New York 14853
17University of Florida, Gainesville, Florida 32611
18Harvard University, Cambridge, Massachusetts 02138
19University of Hawaii at Manoa, Honolulu, Hawaii 96822
20University of Illinois, Urbana-Champaign, Illinois 61801
21Carleton University, Ottawa, Ontario, Canada K1S 5B6the Institute of Particle Physics, Canada
22McGill University, Montréal, Québec, Canada H3A 2T8the Institute of Particle Physics, Canada
23Ithaca College, Ithaca, New York 14850
24University of Kansas, Lawrence, Kansas 66045
25University of Minnesota, Minneapolis, Minnesota 55455
26State University of New York at Albany, Albany, New York 12222
27Ohio State University, Columbus, Ohio 43210
28University of Oklahoma, Norman, Oklahoma 73019
Received 19 September 2000; published 9 January 2001
Using a sample of 9.7×106 BB̅ meson pairs collected with the CLEO detector, we study B decays to the χc1 and χc2 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(B⃗χc1X)=(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 B⃗ψ(2S)X with ψ(2S)→χc1,2γ. We obtain B[B⃗χc1(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(B⃗χc2X), [0.0,1.7]×10-3 for B[B⃗χc2(direct)X], and [0.00,0.44] for the ratio Γ[B⃗χc2(direct)X]/Γ[B⃗χc1(direct)X]. We also measure the branching ratio Γ[B⃗χc2(direct)Xs]/Γ[B⃗χc1(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.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.031102
DOI:
10.1103/PhysRevD.63.031102
*Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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