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Using 13.4 $fb^{-1}$ of data collected with the CLEO detector at the CornellElectron Storage Ring, we have observed 300 events for the two-photonproduction of ground-state pseudo-scalar charmonium in the decay $\eta_c$ ->$K_S K^{\mp} \pi^{\pm}$. We have measured the $\eta_c$ mass to be (2980.4 +-2.3 (stat) +- 0.6 (sys)) MeV and its full width as (27.0 +- 5.8 (stat) +- 1.4(sys)) MeV. We have determined the two-photon partial width of the $\eta_c$meson to be (7.6 +- 0.8 (stat) +- 0.4 (sys) +- 2.3 (br)) keV, with the lastuncertainty associated with the decay branching fraction.

physical review letters

Measurements of the Mass, Total Width, and Two-Photon Partial Width of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>η</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Meson

Measurements of the Mass, Total Width, and Two-Photon Partial Width of theηcMeson