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We study the processes gamma gamma -> K^0_S K pi and gamma gamma -> K+ K- pi+pi- pi0 using a data sample of 519.2 fb-1 recorded by the BaBar detector at thePEP-II asymmetric-energy e+e- collider at center-of-mass energies near theUpsilon(nS) (n = 2,3,4) resonances. We observe the eta_c(1S), chi_c0(1P) andeta_c(2S) resonances produced in two-photon interactions and decaying toK+K-pi+pi-pi0, with significances of 18.1, 5.4 and 5.3 standard deviations(including systematic errors), respectively, and report 4.0sigma evidence ofthe chi_c2(1P) decay to this final state. We measure the eta_c(2S) mass andwidth in K^0_S K pi decays, and obtain the values m(eta_c(2S))= 3638.5 +/- 1.5+/- 0.8 MeV/c^2 and Gamma(eta_c(2S)) = 13.4 +/- 4.6 +/- 3.2 MeV, where thefirst uncertainty is statistical and the second is systematic. We measure thetwo-photon width times branching fraction for the reported resonance signals,and search for the \chi_{c2}(2P) resonance, but no significant signal isobserved.

Observation of eta_c(1S) and eta_c(2S) decays to K+ K- pi+ pi- pi0 in two-photon interactions