  The mass and total width of the eta_c meson have been measured in two-photon
interactions at the SLAC asymmetric B-Factory with the BABAR detector. With a
sample of approximately 2500 reconstructed eta_c -> Ks K pi decays in 88 fb-1
of data, the measured eta_c mass and width are respectively 2982.5 +- 1.1
(stat) +- 0.9 (syst) MeV/c2 and 34.3 +- 2.3 (stat) +- 0.9 (syst) MeV/c2. Using
the same decay mode, a second resonance with 112 +- 24 events is observed with
a mass of 3630.8 +- 3.4 (stat) +- 1.0 (syst) MeV/c2 and width of 17.0 +- 8.3
(stat) +- 2.5 (syst) MeV/c2. This observation is consistent with expectations
for the eta_c(2S) state.
