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

Author
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Abstract
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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
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2000
Journal
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Physical review letters
Volume
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85
Issue
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15
Number of Pages
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3095-9
Date Published
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2000
ISSN Number
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0031-9007
URL
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http://link.aps.org/abstract/PRL/v85/p3095
Short Title
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Phys Rev Lett
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