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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 the PEP-II asymmetric-energy e+e- collider at center-of-mass energies near the Upsilon(nS) (n = 2,3,4) resonances.
- We observe the eta_c(1S), chi_c0(1P) and eta_c(2S) resonances produced in two-photon interactions and decaying to K+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 of the chi_c2(1P) decay to this final state.
- We measure the eta_c(2S) mass and width 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 the first uncertainty is statistical and the second is systematic.
- We measure the two-photon width times branching fraction for the reported resonance signals, and search for the \chi_{c2}(2P) resonance, but no significant signal is observed.
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The power law tails are described by the function B ( x ) = ( Γ ( 1 , 2 ) / 2 ) β ( 1 , 2 ) | x − x 0 | β ( 1 , 2 ) + ( Γ ( 1 , 2 ) / 2 ) β ( 1 , 2 ) B(x)=\frac{(\Gamma_{(1,2)}/2)^{\beta_{(1,2)}}}{|x-x_{0}|^{\beta_{(1,2)}}+(\Gamma_{(1,2)}/2)^{\beta_{(1,2)}}} , where x 0 x_{0} is a parameter, Γ 1 \Gamma_{1} ( Γ 2 \Gamma_{2} ) and β 1 \beta_{1} ( β 2 \beta_{2} ) are used when x < x 0 x<x_{0} ( x > x 0 x>x_{0} ); see Ref. [ 20 ] for more information
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