2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97807We report on the observation of the eta_c^' (2 ^1S_0), the radial excitation of eta_c (1 ^1S_0) ground state of charmonium, in the two-photon fusion reaction gamma gamma to eta_c^' to K_S^0 K^{\pm} pi^{\mp} in 13.4 fb^{-1} of CLEO II/II.V data and 9.2 fb^{-1} of CLEO III data. The data have been analyzed to extract the eta_c^' resonance parameters.10 pages postscript, also available through http://w4.lns.cornell.edu/public/CONF/2003High Energy Physics - Experimenttext