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Measurements of the mass, total width, and two-photon partial width of the eta(c) meson
Ammar, Raymond G. Bean, Alice Besson, David Zeke Davis, Robin E. P. Kwak, Nowhan Zhao, X.
Ammar, Raymond G.
Bean, Alice
Besson, David Zeke
Davis, Robin E. P.
Kwak, Nowhan
Zhao, X.
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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(S)(0)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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2000-10
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AMERICAN PHYSICAL SOC
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Brandenburg, G, Ershov, A, et al. Measurements of the mass, total width, and two-photon partial width of the eta(c) meson. AMERICAN PHYSICAL SOC. October 2000. 85(15) : 3095-3099