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Measurements of the mass, total width, and two-photon partial width of the eta(c) meson |
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| Authors: | 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 |
| Affiliation: | Harvard University, Cambridge, Massachusetts 02138, USA. |
| 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. |
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