Measurements of the mass, total width, and two-photon partial width of the eta(c) meson. Brandenburg G , Ershov A , Gao Y S , Kim D Y , Wilson R , Browder T E , Li Y , Rodriguez J L , Yamamoto H , Bergfeld T , Eisenstein B I , Ernst J , Gladding G E , Gollin G D , Hans R M , Johnson E , Karliner I , Marsh M A , Palmer M , Plager C , Sedlack C , Selen M , Thaler J J , Williams J , Edwards K W , Janicek R , Patel P M , Sadoff A J , Ammar R , Bean A , Besson D , Davis R , Kwak N , Zhao X , Anderson S , Frolov V V , Kubota Y , Lee S J , Mahapatra R , O'Neill J J , Poling R , Riehle T , Smith A , Stepaniak C J , Urheim J , Ahmed S , Alam M S , Athar S B , Jian L , Ling L , Saleem M , Timm S , Wappler F , Anastassov A , Duboscq J E , Eckhart E , Gan K K , Gwon C , Hart T , Honscheid K , Hufnagel D , Kagan H , Kass R , Pedlar T K , Schwarthoff H , Thayer J B , von Toerne E , Zoeller M M , Richichi S J , Severini H , Skubic P , Undrus A , Chen S , Fast J , Hinson J W , Lee J , Miller D H , Shibata E I , Shipsey I P , Pavlunin V , Cronin-Hennessy D , Lyon A L , Thorndike E H , Jessop C P , Marsiske H , Perl M L , Savinov V , Ugolini D , Zhou X , Coan T E , Fadeyev V , Maravin Y , Narsky I , Stroynowski R , Ye J , Wlodek T , Artuso M , Ayad R , Boulahouache C , Bukin K , Dambasuren E , Karamov S , Majumder G , Moneti G C , Mountain R , Schuh S , Skwarnicki T , Stone S , Viehhauser G , Wang J C , Wolf A , Wu J , Kopp S , Mahmood A H , Csorna S E , Danko I , McLean K W , Márka S , Xu Z , Godang R , Kinoshita K , Lai I C , Schrenk S , Bonvicini G , Cinabro D , McGee S , Perera L P , Zhou G J , Lipeles E , Pappas S P , Schmidtler M , Shapiro A , Sun W M , Weinstein A J , Würthwein F , Jaffe D E , Masek G , Paar H P , Potter E M , Prell S , Sharma V , Asner D M , Eppich A , Hill T S , Morrison R J , Briere R A , Ferguson T , Vogel H , Behrens B H , Ford W T , Gritsan A , Roy J , Smith J G , Alexander J P , Baker R , Bebek C , Berger B E , Berkelman K , Blanc F , Boisvert V , Cassel D G , Dickson M , Drell P S , Ecklund K M , Ehrlich R , Foland A D , Gaidarev P , Galik R S , Gibbons L , Gittelman B , Gray S W , Hartill D L , Heltsley B K , Hopman P I , Jones C D , Kreinick D L , Lohner M , Magerkurth A , Meyer T O , Mistry N B , Nordberg E , Patterson J R , Peterson D , Riley D , Thayer J G , Thies P G , Urner D , Valant-Spaight B , Warburton A , Avery P , Prescott C , Rubiera A I , Yelton J , Zheng J , Null Null Physical review letters（2000）
摘要
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.
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