Phys. Rev. D
73,
071101(R)
(2006)
[5 pages]
Two-photon width of the charmonium state χc2
S. Dobbs et al. CLEO Collaboration
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S. Dobbs1, Z. Metreveli1, K. K. Seth1, A. Tomaradze1, P. Zweber1, J. Ernst2, K. Arms3, H. Severini4, S. A. Dytman5, W. Love5, S. Mehrabyan5, J. A. Mueller5, V. Savinov5, Z. Li6, A. Lopez6, H. Mendez6, J. Ramirez6, G. S. Huang7, D. H. Miller7, V. Pavlunin7, B. Sanghi7, I. P. J. Shipsey7, G. S. Adams8, M. Anderson8, J. P. Cummings8, I. Danko8, J. Napolitano8, Q. He9, H. Muramatsu9, C. S. Park9, E. H. Thorndike9, T. E. Coan10, Y. S. Gao10, F. Liu10, M. Artuso11, C. Boulahouache11, S. Blusk11, J. Butt11, O. Dorjkhaidav11, J. Li11, N. Menaa11, R. Mountain11, K. Randrianarivony11, R. Redjimi11, R. Sia11, T. Skwarnicki11, S. Stone11, J. C. Wang11, K. Zhang11, S. E. Csorna12, G. Bonvicini13, D. Cinabro13, M. Dubrovin13, A. Lincoln13, A. Bornheim14, S. P. Pappas14, A. J. Weinstein14, R. A. Briere15, G. P. Chen15, J. Chen15, T. Ferguson15, G. Tatishvili15, H. Vogel15, M. E. Watkins15, J. L. Rosner16, N. E. Adam17, J. P. Alexander17, K. Berkelman17, D. G. Cassel17, J. E. Duboscq17, K. M. Ecklund17, R. Ehrlich17, L. Fields17, R. S. Galik17, L. Gibbons17, R. Gray17, S. W. Gray17, D. L. Hartill17, B. K. Heltsley17, D. Hertz17, C. D. Jones17, J. Kandaswamy17, D. L. Kreinick17, V. E. Kuznetsov17, H. Mahlke-Krüger17, T. O. Meyer17, P. U. E. Onyisi17, J. R. Patterson17, D. Peterson17, E. A. Phillips17, J. Pivarski17, D. Riley17, A. Ryd17, A. J. Sadoff17, H. Schwarthoff17, X. Shi17, M. R. Shepherd17, S. Stroiney17, W. M. Sun17, T. Wilksen17, M. Weinberger17, S. B. Athar18, P. Avery18, L. Breva-Newell18, R. Patel18, V. Potlia18, H. Stoeck18, J. Yelton18, P. Rubin19, C. Cawlfield20, B. I. Eisenstein20, I. Karliner20, D. Kim20, N. Lowrey20, P. Naik20, C. Sedlack20, M. Selen20, E. J. White20, J. Williams20, J. Wiss20, D. M. Asner21, K. W. Edwards21, D. Besson22, T. K. Pedlar23, D. Cronin-Hennessy24, K. Y. Gao24, D. T. Gong24, J. Hietala24, Y. Kubota24, T. Klein24, B. W. Lang24, S. Z. Li24, R. Poling24, A. W. Scott24, and A. Smith24 (CLEO Collaboration)
1Northwestern University, Evanston, Illinois 60208, USA
2State University of New York at Albany, Albany, New York 12222, USA
3Ohio State University, Columbus, Ohio 43210, USA
4University of Oklahoma, Norman, Oklahoma 73019, USA
5University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
6University of Puerto Rico, Mayaguez, Puerto Rico 00681
7Purdue University, West Lafayette, Indiana 47907, USA
8Rensselaer Polytechnic Institute, Troy, New York 12180, USA
9University of Rochester, Rochester, New York 14627, USA
10Southern Methodist University, Dallas, Texas 75275, USA
11Syracuse University, Syracuse, New York 13244, USA
12Vanderbilt University, Nashville, Tennessee 37235, USA
13Wayne State University, Detroit, Michigan 48202, USA
14California Institute of Technology, Pasadena, California 91125, USA
15Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
16Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
17Cornell University, Ithaca, New York 14853
18University of Florida, Gainesville, Florida 32611, USA
19George Mason University, Fairfax, Virginia 22030, USA
20University of Illinois, Urbana-Champaign, Illinois 61801, USA
21Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
22University of Kansas, Lawrence, Kansas 66045, USA
23Luther College, Decorah, Iowa 52101, USA
24University of Minnesota, Minneapolis, Minnesota 55455, USA
Received 2 October 2005; published 6 April 2006
The two-photon width of χc2(3P2) state of charmonium has been measured using 14.4 fb-1 of e+e- data taken at √s=9.46–11.30 GeV with the CLEO III detector. The γγ-fusion reaction studied is e+e-→e+e-γγ, γγ→χc2→γJ/ψ→γe+e-(μ+μ-). We measure Γγγ(χc2)B(χc2→γJ/ψ)B(J/ψ→e+e-+μ+μ-)=13.2±1.4(stat)±1.1(syst) eV, and obtain Γγγ(χc2)=559±57(stat)±48(syst)±36(br) eV. This result is in excellent agreement with the result of γγ-fusion measurement by Belle and is consistent with that of the p̅ p→χc2→γγ measurement, when they are both reevaluated using the recent CLEO result for the radiative decay χc2→γJ/ψ.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.73.071101
DOI:
10.1103/PhysRevD.73.071101
PACS:
13.20.Gd, 13.40.Hq, 14.40.Gx
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