Phys. Rev. Lett.
86,
30–34
(2001)
Study of B Decays to Charmonium States: B→ηcK and B→χc0K
K. W. Edwards et al. (CLEO Collaboration)
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K. W. Edwards1a,1b, R. Janicek2a,2b, P. M. Patel2a,2b, A. J. Sadoff3, R. Ammar4, A. Bean4, D. Besson4, R. Davis4, N. Kwak4, X. Zhao4, S. Anderson5, V. V. Frolov5, Y. Kubota5, S. J. Lee5, R. Mahapatra5, J. J. O'Neill5, R. Poling5, T. Riehle5, A. Smith5, C. J. Stepaniak5, J. Urheim5, S. Ahmed6, M. S. Alam6, S. B. Athar6, L. Jian6, L. Ling6, M. Saleem6, S. Timm6, F. Wappler6, A. Anastassov7, J. E. Duboscq7, E. Eckhart7, K. K. Gan7, C. Gwon7, T. Hart7, K. Honscheid7, D. Hufnagel7, H. Kagan7, R. Kass7, T. K. Pedlar7, H. Schwarthoff7, J. B. Thayer7, E. von Toerne7, M. M. Zoeller7, S. J. Richichi8, H. Severini8, P. Skubic8, A. Undrus8, S. Chen9, J. Fast9, J. W. Hinson9, J. Lee9, D. H. Miller9, E. I. Shibata9, I. P. J. Shipsey9, V. Pavlunin9, D. Cronin-Hennessy10, A. L. Lyon10, E. H. Thorndike10, C. P. Jessop11, H. Marsiske11, M. L. Perl11, V. Savinov11, D. Ugolini11, X. Zhou11, T. E. Coan12, V. Fadeyev12, Y. Maravin12, I. Narsky12, R. Stroynowski12, J. Ye12, T. Wlodek12, M. Artuso13, R. Ayad13, C. Boulahouache13, K. Bukin13, E. Dambasuren13, S. Karamov13, G. Majumder13, G. C. Moneti13, R. Mountain13, S. Schuh13, T. Skwarnicki13, S. Stone13, G. Viehhauser13, J. C. Wang13, A. Wolf13, J. Wu13, S. Kopp14, A. H. Mahmood15, S. E. Csorna16, I. Danko16, K. W. McLean16, Sz. Márka16, Z. Xu16, R. Godang17, K. Kinoshita17,*, I. C. Lai17, S. Schrenk17, G. Bonvicini18, D. Cinabro18, S. McGee18, L. P. Perera18, G. J. Zhou18, E. Lipeles19, S. P. Pappas19, M. Schmidtler19, A. Shapiro19, W. M. Sun19, A. J. Weinstein19, F. Würthwein19,†, D. E. Jaffe20, G. Masek20, H. P. Paar20, E. M. Potter20, S. Prell20, V. Sharma20, D. M. Asner21, A. Eppich21, T. S. Hill21, R. J. Morrison21, R. A. Briere22, B. H. Behrens23, W. T. Ford23, A. Gritsan23, J. Roy23, J. G. Smith23, J. P. Alexander24, R. Baker24, C. Bebek24, B. E. Berger24, K. Berkelman24, F. Blanc24, V. Boisvert24, D. G. Cassel24, M. Dickson24, P. S. Drell24, K. M. Ecklund24, R. Ehrlich24, A. D. Foland24, P. Gaidarev24, L. Gibbons24, B. Gittelman24, S. W. Gray24, D. L. Hartill24, B. K. Heltsley24, P. I. Hopman24, C. D. Jones24, D. L. Kreinick24, M. Lohner24, A. Magerkurth24, T. O. Meyer24, N. B. Mistry24, E. Nordberg24, J. R. Patterson24, D. Peterson24, D. Riley24, J. G. Thayer24, P. G. Thies24, B. Valant-Spaight24, A. Warburton24, P. Avery25, C. Prescott25, A. I. Rubiera25, J. Yelton25, J. Zheng25, G. Brandenburg26, A. Ershov26, Y. S. Gao26, D. Y.-J. Kim26, R. Wilson26, T. E. Browder27, Y. Li27, J. L. Rodriguez27, H. Yamamoto27, T. Bergfeld28, B. I. Eisenstein28, J. Ernst28, G. E. Gladding28, G. D. Gollin28, R. M. Hans28, E. Johnson28, I. Karliner28, M. A. Marsh28, M. Palmer28, C. Plager28, C. Sedlack28, M. Selen28, J. J. Thaler28, and J. Williams28 (CLEO Collaboration)
1aCarleton University, Ottawa, Ontario, Canada K1S 5B6
1band the Institute of Particle Physics, Canada
2aMcGill University, Montréal, Québec, Canada H3A 2T8
2band the Institute of Particle Physics, Canada
3Ithaca College, Ithaca, New York 14850
4University of Kansas, Lawrence, Kansas 66045
5University of Minnesota, Minneapolis, Minnesota 55455
6State University of New York at Albany, Albany, New York 12222
7The Ohio State University, Columbus, Ohio 43210
8University of Oklahoma, Norman, Oklahoma 73019
9Purdue University, West Lafayette, Indiana 47907
10University of Rochester, Rochester, New York 14627
11Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
12Southern Methodist University, Dallas, Texas 75275
13Syracuse University, Syracuse, New York 13244
14University of Texas, Austin, Texas 78712
15University of Texas–Pan American, Edinburg, Texas 78539
16Vanderbilt University, Nashville, Tennessee 37235
17Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
18Wayne State University, Detroit, Michigan 48202
19California Institute of Technology, Pasadena, California 91125
20University of California, San Diego, La Jolla, California 92093
21University of California, Santa Barbara, California 93106
22Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
23University of Colorado, Boulder, Colorado 80309-0390
24Cornell University, Ithaca, New York 14853
25University of Florida, Gainesville, Florida 32611
26Harvard University, Cambridge, Massachusetts 02138
27University of Hawaii at Manoa, Honolulu, Hawaii 96822
28University of Illinois, Urbana-Champaign, Illinois 61801
Received 7 July 2000; published in the issue dated 1 January 2001
In a sample of 9.66×106BB̅ pairs collected with the CLEO detector we make the first observation of B decays to an ηc and a kaon. We measure branching fractions B(B+→ηcK+) = (0.69-0.21+0.26±0.08±0.20)×10-3 and B(B°→ηcK°) = (1.09-0.42+0.55±0.12±0.31)×10-3, where the first error is statistical, the second is systematic, and the third is from the ηc branching fraction uncertainty. From these we extract the ηc decay constant in the factorization approximation, fηc = 335±75 MeV. We also search for B decays to a χc0 and a kaon. No evidence for a signal is found and we set 90% C.L. upper limits: B(B+→χc0K+)<4.8×10-4 and B(B°→χc0K°)<5.0×10-4.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.30
DOI:
10.1103/PhysRevLett.86.30
*Permanent address: University of Cincinnati, Cincinnati, OH 45221. †Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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