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

Journal article

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.

Authors: Brandenburg, G; Ershov, A; Gao, Y; Kim, D; Wilson, R

• Publication status: Published
• Publisher: American Inst of Physics
• Journal: Physical Review Letters
• Volume: 85
• Issue: 15
• Pages: 3095-3099
• Publication date: 2000-10-01
• DOI: 10.1103/physrevlett.85.3095
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: CLEO Collaboration