Phys. Rev. Lett.
92,
142001
(2004)
[5 pages]
Observation of ηc′ Production in γγ Fusion at CLEO
D. M. Asner et al. CLEO Collaboration
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D. M. Asner1, S. A. Dytman1, S. Mehrabyan1, J. A. Mueller1, S. Nam1, V. Savinov1, G. S. Huang2, D. H. Miller2, V. Pavlunin2, B. Sanghi2, E. I. Shibata2, I. P. J. Shipsey2, G. S. Adams3, M. Chasse3, J. P. Cummings3, I. Danko3, J. Napolitano3, D. Cronin-Hennessy4, C. S. Park4, W. Park4, J. B. Thayer4, E. H. Thorndike4, T. E. Coan5, Y. S. Gao5, F. Liu5, R. Stroynowski5, M. Artuso6, C. Boulahouache6, S. Blusk6, J. Butt6, E. Dambasuren6, O. Dorjkhaidav6, J. Haynes6, N. Menaa6, R. Mountain6, H. Muramatsu6, R. Nandakumar6, R. Redjimi6, R. Sia6, T. Skwarnicki6, S. Stone6, J. C. Wang6, Kevin Zhang6, A. H. Mahmood7, S. E. Csorna8, G. Bonvicini9, D. Cinabro9, M. Dubrovin9, A. Bornheim10, E. Lipeles10, S. P. Pappas10, A. Shapiro10, A. J. Weinstein10, R. Mahapatra11, H. N. Nelson11, R. A. Briere12, G. P. Chen12, T. Ferguson12, G. Tatishvili12, H. Vogel12, M. E. Watkins12, N. E. Adam13, J. P. Alexander13, K. Berkelman13, V. Boisvert13, D. G. Cassel13, J. E. Duboscq13, K. M. Ecklund13, R. Ehrlich13, R. S. Galik13, L. Gibbons13, B. Gittelman13, S. W. Gray13, D. L. Hartill13, B. K. Heltsley13, L. Hsu13, C. D. Jones13, J. Kandaswamy13, D. L. Kreinick13, V. E. Kuznetsov13, A. Magerkurth13, H. Mahlke-Krüger13, T. O. Meyer13, J. R. Patterson13, T. K. Pedlar13, D. Peterson13, J. Pivarski13, D. Riley13, A. J. Sadoff13, H. Schwarthoff13, M. R. Shepherd13, W. M. Sun13, J. G. Thayer13, D. Urner13, T. Wilksen13, M. Weinberger13, S. B. Athar14, P. Avery14, L. Breva-Newell14, V. Potlia14, H. Stoeck14, J. Yelton14, B. I. Eisenstein15, G. D. Gollin15, I. Karliner15, N. Lowrey15, P. Naik15, C. Sedlack15, M. Selen15, J. J. Thaler15, J. Williams15, K. W. Edwards16, D. Besson17, K. Y. Gao18, D. T. Gong18, Y. Kubota18, S. Z. Li18, R. Poling18, A. W. Scott18, A. Smith18, C. J. Stepaniak18, J. Urheim18, Z. Metreveli19, K. K. Seth19, A. Tomaradze19, P. Zweber19, K. Arms20, E. Eckhart20, K. K. Gan20, C. Gwon20, H. Severini21, and P. Skubic21 (CLEO Collaboration)
1University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
2Purdue University, West Lafayette, Indiana 47907, USA
3Rensselaer Polytechnic Institute, Troy, New York 12180, USA
4University of Rochester, Rochester, New York 14627, USA
5Southern Methodist University, Dallas, Texas 75275, USA
6Syracuse University, Syracuse, New York 13244, USA
7University of Texas-Pan American, Edinburg, Texas 78539, USA
8Vanderbilt University, Nashville, Tennessee 37235, USA
9Wayne State University, Detroit, Michigan 48202, USA
10California Institute of Technology, Pasadena, California 91125, USA
11University of California, Santa Barbara, California 93106, USA
12Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
13Cornell University, Ithaca, New York 14853, USA
14University of Florida, Gainesville, Florida 32611, USA
15University of Illinois, Urbana-Champaign, Illinois 61801, USA
16Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
17University of Kansas, Lawrence, Kansas 66045, USA
18University of Minnesota, Minneapolis, Minnesota 55455, USA
19Northwestern University, Evanston, Illinois 60208, USA
20Ohio State University, Columbus, Ohio 43210, USA
21University of Oklahoma, Norman, Oklahoma 73019, USA
Received 23 December 2003; published 5 April 2004
We report on the observation of the ηc′(21S0), the radial excitation of the ηc(11S0) ground state of charmonium, in the two-photon fusion reaction γγ→ηc′→KS0K±π∓ in 13.6 fb-1 of CLEO II/II.V data and 13.1 fb-1 of CLEO III data. We obtain M(ηc′)=3642.9±3.1(stat)±1.5(syst) MeV and M(ηc)=2981.8±1.3(stat)±1.5(syst) MeV. The corresponding values of hyperfine splittings between 1S0 and 3S1 states are ΔMhf(1S)=115.1±2.0 MeV and ΔMhf(2S)= 43.1±3.4 MeV. Assuming that the ηc and ηc′ have equal branching fractions to KSKπ, we obtain Γγγ(ηc′)=1.3±0.6 keV.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.142001
DOI:
10.1103/PhysRevLett.92.142001
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