Phys. Rev. Lett. 85, 3095 - 3099 (2000)
Measurements of the Mass, Total Width, and Two-Photon Partial Width of the ηc Meson
G. Brandenburg et al. (CLEO Collaboration)
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G. Brandenburg1, A. Ershov1, Y. S. Gao1, D. Y.-J. Kim1, R. Wilson1, T. E. Browder2, Y. Li2, J. L. Rodriguez2, H. Yamamoto2, T. Bergfeld3, B. I. Eisenstein3, J. Ernst3, G. E. Gladding3, G. D. Gollin3, R. M. Hans3, E. Johnson3, I. Karliner3, M. A. Marsh3, M. Palmer3, C. Plager3, C. Sedlack3, M. Selen3, J. J. Thaler3, J. Williams3, K. W. Edwards4,4b, R. Janicek5,5b, P. M. Patel5,5b, A. J. Sadoff6, R. Ammar7, A. Bean7, D. Besson7, R. Davis7, N. Kwak7, X. Zhao7, S. Anderson8, V. V. Frolov8, Y. Kubota8, S. J. Lee8, R. Mahapatra8, J. J. O'Neill8, R. Poling8, T. Riehle8, A. Smith8, C. J. Stepaniak8, J. Urheim8, S. Ahmed9, M. S. Alam9, S. B. Athar9, L. Jian9, L. Ling9, M. Saleem9, S. Timm9, F. Wappler9, A. Anastassov10, J. E. Duboscq10, E. Eckhart10, K. K. Gan10, C. Gwon10, T. Hart10, K. Honscheid10, D. Hufnagel10, H. Kagan10, R. Kass10, T. K. Pedlar10, H. Schwarthoff10, J. B. Thayer10, E. von Toerne10, M. M. Zoeller10, S. J. Richichi11, H. Severini11, P. Skubic11, A. Undrus11, S. Chen12, J. Fast12, J. W. Hinson12, J. Lee12, D. H. Miller12, E. I. Shibata12, I. P. J. Shipsey12, V. Pavlunin12, D. Cronin-Hennessy13, A. L. Lyon13, E. H. Thorndike13, C. P. Jessop14, H. Marsiske14, M. L. Perl14, V. Savinov14, D. Ugolini14, X. Zhou14, T. E. Coan15, V. Fadeyev15, Y. Maravin15, I. Narsky15, R. Stroynowski15, J. Ye15, T. Wlodek15, M. Artuso16, R. Ayad16, C. Boulahouache16, K. Bukin16, E. Dambasuren16, S. Karamov16, G. Majumder16, G. C. Moneti16, R. Mountain16, S. Schuh16, T. Skwarnicki16, S. Stone16, G. Viehhauser16, J. C. Wang16, A. Wolf16, J. Wu16, S. Kopp17, A. H. Mahmood18, S. E. Csorna19, I. Danko19, K. W. McLean19, Sz. Márka19, Z. Xu19, R. Godang20, K. Kinoshita20 *, I. C. Lai20, S. Schrenk20, G. Bonvicini21, D. Cinabro21, S. McGee21, L. P. Perera21, G. J. Zhou21, E. Lipeles22, S. P. Pappas22, M. Schmidtler22, A. Shapiro22, W. M. Sun22, A. J. Weinstein22, F. Würthwein22 †, D. E. Jaffe23, G. Masek23, H. P. Paar23, E. M. Potter23, S. Prell23, V. Sharma23, D. M. Asner24, A. Eppich24, T. S. Hill24, R. J. Morrison24, R. A. Briere25, T. Ferguson25, H. Vogel25, B. H. Behrens26, W. T. Ford26, A. Gritsan26, J. Roy26, J. G. Smith26, J. P. Alexander27, R. Baker27, C. Bebek27, B. E. Berger27, K. Berkelman27, F. Blanc27, V. Boisvert27, D. G. Cassel27, M. Dickson27, P. S. Drell27, K. M. Ecklund27, R. Ehrlich27, A. D. Foland27, P. Gaidarev27, R. S. Galik27, L. Gibbons27, B. Gittelman27, S. W. Gray27, D. L. Hartill27, B. K. Heltsley27, P. I. Hopman27, C. D. Jones27, D. L. Kreinick27, M. Lohner27, A. Magerkurth27, T. O. Meyer27, N. B. Mistry27, E. Nordberg27, J. R. Patterson27, D. Peterson27, D. Riley27, J. G. Thayer27, P. G. Thies27, D. Urner27, B. Valant-Spaight27, A. Warburton27, P. Avery28, C. Prescott28, A. I. Rubiera28, J. Yelton28, and J. Zheng28 (CLEO Collaboration)
1Harvard University, Cambridge, Massachusetts 02138
2University of Hawaii at Manoa, Honolulu, Hawaii 96822
3University of Illinois, Urbana-Champaign, Illinois 61801
4aCarleton University, Ottawa, Ontario, Canada K1S 5B6
4band the Institute of Particle Physics, Canada
5aMcGill University, Montréal, Québec, Canada H3A 2T8
5band the Institute of Particle Physics, Canada
6Ithaca College, Ithaca, New York 14850
7University of Kansas, Lawrence, Kansas 66045
8University of Minnesota, Minneapolis, Minnesota 55455
9State University of New York at Albany, Albany, New York 12222
10The Ohio State University, Columbus, Ohio 43210
11University of Oklahoma, Norman, Oklahoma 73019
12Purdue University, West Lafayette, Indiana 47907
13University of Rochester, Rochester, New York 14627
14Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
15Southern Methodist University, Dallas, Texas 75275
16Syracuse University, Syracuse, New York 13244
17University of Texas, Austin, Texas 78712
18University of Texas-Pan American, Edinburg, Texas 78539
19Vanderbilt University, Nashville, Tennessee 37235
20Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
21Wayne State University, Detroit, Michigan 48202
22California Institute of Technology, Pasadena, California 91125
23University of California, San Diego, La Jolla, California 92093
24University of California, Santa Barbara, California 93106
25Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
26University of Colorado, Boulder, Colorado 80309-0390
27Cornell University, Ithaca, New York 14853
28University of Florida, Gainesville, Florida 32611
Received 20 June 2000
Using 13.4 fb-1 of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudoscalar charmonium in the decay ηc→KS0K∓π±. We have measured the ηc mass to be [2980.4±2.3 (stat)±0.6 (syst)] MeV and its full width as [27.0±5.8 (stat)±1.4 (syst)] MeV. We have determined the two-photon partial width of the ηc meson to be [7.6±0.8 (stat)±0.4 (syst)±2.3 (br)] keV, with the last uncertainty associated with the decay branching fraction.
©2000 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.85.3095
DOI: 10.1103/PhysRevLett.85.3095
PACS: 14.40.Gx, 13.20.Gd
* Permanent address: University of Cincinnati, Cincinnati, OH 45221.
† Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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