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Observation of eta'c production in gammagamma fusion at CLEO |
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| Authors: | Asner D M Dytman S A Mehrabyan S Mueller J A Nam S Savinov V Huang G S Miller D H Pavlunin V Sanghi B Shibata E I Shipsey I P J Adams G S Chasse M Cummings J P Danko I Napolitano J Cronin-Hennessy D Park C S Park W Thayer J B Thorndike E H Coan T E Gao Y S Liu F Stroynowski R Artuso M Boulahouache C Blusk S Butt J Dambasuren E Dorjkhaidav O Haynes J Menaa N Mountain R Muramatsu H Nandakumar R Redjimi R Sia R Skwarnicki T Stone S Wang J C Zhang Kevin Mahmood A H Csorna S E Bonvicini G Cinabro D Dubrovin M Bornheim A Lipeles E Pappas S P Shapiro A Weinstein A J Mahapatra R Nelson H N Briere R A |
| Affiliation: | University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA. |
| Abstract: | We report on the observation of the eta(')(c)(2(1)S0), the radial excitation of the eta(c)(1(1)S0) ground state of charmonium, in the two-photon fusion reaction gammagamma-->eta(')(c)-->K(0)(S)K+/-pi(-/+) in 13.6 fb(-1) of CLEO II/II.V data and 13.1 fb(-1) of CLEO III data. We obtain M(eta(')(c))=3642.9+/-3.1(stat)+/-1.5(syst) MeV and M(eta(c))=2981.8+/-1.3(stat)+/-1.5(syst) MeV. The corresponding values of hyperfine splittings between 1S0 and 3S1 states are DeltaM(hf)(1S)=115.1+/-2.0 MeV and DeltaM(hf)(2S)=43.1+/-3.4 MeV. Assuming that the eta(c) and eta(')(c) have equal branching fractions to K(S)Kpi, we obtain Gamma(gammagamma)(eta(')(c))=1.3+/-0.6 keV. |
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