Measurements of the mass, total width, and two-photon partial width of the eta(c) meson.

Author	: G Brandenburg A Ershov YS Gao DY Kim R Wilson TE Browder Y Li JL Rodriguez H Yamamoto T Bergfeld BI Eisenstein J Ernst GE Gladding GD Gollin RM Hans E Johnson I Karliner MA Marsh M Palmer C Plager C Sedlack M Selen JJ Thaler J Williams KW Edwards R Janicek PM Patel AJ Sadoff R Ammar A Bean D Besson R Davis N Kwak X Zhao S Anderson VV Frolov Y Kubota SJ Lee R Mahapatra JJ O'Neill R Poling T Riehle A Smith CJ Stepaniak J Urheim S Ahmed MS Alam SB Athar L Jian L Ling M Saleem S Timm F Wappler A Anastassov JE Duboscq E Eckhart KK Gan C Gwon T Hart K Honscheid D Hufnagel H Kagan R Kass TK Pedlar H Schwarthoff JB Thayer E von Toerne MM Zoeller SJ Richichi H Severini P Skubic A Undrus S Chen J Fast JW Hinson J Lee DH Miller EI Shibata IP Shipsey Pavlunin V D Cronin-Hennessy AL Lyon EH Thorndike CP Jessop H Marsiske ML Perl Savinov V D Ugolini X Zhou TE Coan Fadeyev V Y Maravin I Narsky R Stroynowski J Ye T Wlodek M Artuso R Ayad C Boulahouache K Bukin E Dambasuren S Karamov G Majumder GC Moneti R Mountain S Schuh T Skwarnicki S Stone G Viehhauser JC Wang A Wolf J Wu S Kopp AH Mahmood SE Csorna I Danko KW McLean S Márka Z Xu R Godang K Kinoshita IC Lai S Schrenk G Bonvicini D Cinabro S McGee LP Perera GJ Zhou E Lipeles SP Pappas M Schmidtler A Shapiro WM Sun AJ Weinstein F Würthwein DE Jaffe G Masek HP Paar EM Potter S Prell Sharma V DM Asner A Eppich TS Hill RJ Morrison RA Briere T Ferguson H Vogel BH Behrens WT Ford A Gritsan J Roy JG Smith JP Alexander R Baker C Bebek BE Berger K Berkelman F Blanc Boisvert V DG Cassel M Dickson PS Drell KM Ecklund R Ehrlich AD Foland P Gaidarev RS Galik L Gibbons B Gittelman SW Gray DL Hartill BK Heltsley PI Hopman CD Jones DL Kreinick M Lohner A Magerkurth TO Meyer NB Mistry E Nordberg Patterson JR D Peterson D Riley JG Thayer PG Thies D Urner B Valant-Spaight A Warburton P Avery C Prescott AI Rubiera J Yelton J Zheng Collaboration CLEO
Abstract	: 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 eta(c)-->K(0)(S)K-/+pi(+/-). We have measured the eta(c) 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 eta(c) 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.
Year of Publication	: 2000
Journal	: Physical review letters
Volume	: 85
Issue	: 15
Number of Pages	: 3095-9
Date Published	: 2000
ISSN Number	: 0031-9007
URL	: http://link.aps.org/abstract/PRL/v85/p3095
Short Title	: Phys Rev Lett
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