Observation Of Eta '(C) Production In Gamma Gamma Fusion At Cleo

D. M. Asner,S. A. Dytman,S. Mehrabyan,J. A. Mueller,S. Nam, V. Savinov,G. S. Huang,D. H. Miller, V. Pavlunin,B. Sanghi,E. I. Shibata, I. P. J. Shipsey,G. S. Adams,M. Chasse,J. P. Cummings,I. Danko,J. Napolitano,D. Cronin-Hennessy, W. Park,J. B. Thayer,E. H. Thorndike,T. E. Coan,Y. S. Gao,F. Liu, R. Stroynowski,M. Artuso, C. Boulahouache,S. Blusk, J. Butt,E. Dambasuren,O. Dorjkhaidav,J. Haynes,N. Menaa,H. Muramatsu,R. Nandakumar, R. Redjimi, R. Sia,T. Skwarnicki, S. Stone,J. C. Wang,Kevin Zhang,A. H. Mahmood,S. E. Csorna,G. Bonvicini,D. Cinabro,M. Dubrovin,A. Bornheim, E. Lipeles,S. P. Pappas,A. Shapiro, A. J. Weinstein,R. Mahapatra,H. N. Nelson,R. A. Briere,G. P. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,N. E. Adam,K. Berkelman, V. Boisvert,D. G. Cassel,J. E. Duboscq,K. M. Ecklund,R. Ehrlich,R. S. Galik, L. Gibbons,B. Gittelman,S. W. Gray,D. L. Hartill, B. K. Heltsley,L. Hsu,C. D. Jones,J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov,A. Magerkurth,H. Mahlke-Kruger, T. O. Meyer, J. R. Patterson,T. K. Pedlar, D. Peterson,J. Pivarski, D. Riley,A. J. Sadoff,H. Schwarthoff,M. R. Shepherd,W. M. Sun,J. G. Thayer,D. Urner,T. Wilksen,M. Weinberger,S. B. Athar, P. Avery,L. Breva-Newell,V. Potlia,H. Stoeck,J. Williams, K. W. Edwards, D. Besson, V. V. Frolov,K. Y. Gao,D. T. Gong,Y. Kubota,R. Poling,A. W. Scott,A. Smith,C. J. Stepaniak, J. Urheim,Z. Metreveli,K. K. Seth, A. Tomaradze,P. Zweber,D. Gong,Y. Kubota,S. Li,R. Poling,A. Scott,A. Smith,C. Stepaniak,J. Urheim, Z. Metreveli,K. Seth, A. Tomaradze,P. Zweber,K. Arms,E. Eckhart,K. Gan,C. Gwon, H. Severini, P. Skubic

PHYSICAL REVIEW LETTERS（2004）

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摘要

We report on the observation of the eta(c)'(2(1)S(0)), the radial excitation of the eta(c)(1(1)S(0)) ground state of charmonium, in the two-photon fusion reaction gammagamma --> eta(c)' --> (KsK+/-)-K-0 pi(-/+) in 13.6 fb(-1) of CLEO II/ILV 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 S-1(0) and S-3(1) 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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