Phys. Rev. Lett.
87,
061801
(2001)
[5 pages]
Experimental Investigation of the Two-Photon Widths of the χc0 and the χc2 Mesons
B. I. Eisenstein et al. (CLEO Collaboration)
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B. I. Eisenstein1, J. Ernst1, G. E. Gladding1, G. D. Gollin1, R. M. Hans1, E. Johnson1, I. Karliner1, M. A. Marsh1, C. Plager1, C. Sedlack1, M. Selen1, J. J. Thaler1, J. Williams1, K. W. Edwards2a,2b, A. J. Sadoff3, R. Ammar4, A. Bean4, D. Besson4, X. Zhao4, S. Anderson5, V. V. Frolov5, Y. Kubota5, S. J. Lee5, R. Poling5, A. Smith5, C. J. Stepaniak5, J. Urheim5, S. Ahmed6, M. S. Alam6, S. B. Athar6, L. Jian6, L. Ling6, M. Saleem6, S. Timm6, F. Wappler6, A. Anastassov7, E. Eckhart7, K. K. Gan7, C. Gwon7, T. Hart7, K. Honscheid7, D. Hufnagel7, H. Kagan7, R. Kass7, T. K. Pedlar7, J. B. Thayer7, E. von Toerne7, M. M. Zoeller7, S. J. Richichi8, H. Severini8, P. Skubic8, A. Undrus8, V. Savinov9, S. Chen10, J. W. Hinson10, J. Lee10, D. H. Miller10, E. I. Shibata10, I. P. J. Shipsey10, V. Pavlunin10, D. Cronin-Hennessy11, A. L. Lyon11, E. H. Thorndike11, T. E. Coan12, V. Fadeyev12, Y. S. Gao12, Y. Maravin12, I. Narsky12, R. Stroynowski12, J. Ye12, T. Wlodek12, M. Artuso13, K. Benslama13, C. Boulahouache13, K. Bukin13, E. Dambasuren13, G. Majumder13, R. Mountain13, T. Skwarnicki13, S. Stone13, J. C. Wang13, A. Wolf13, S. Kopp14, M. Kostin14, A. H. Mahmood15, S. E. Csorna16, I. Danko16, K. W. McLean16, Z. Xu16, R. Godang17, G. Bonvicini18, D. Cinabro18, M. Dubrovin18, S. McGee18, A. Bornheim19, E. Lipeles19, S. P. Pappas19, A. Shapiro19, W. M. Sun19, A. J. Weinstein19, D. E. Jaffe20, R. Mahapatra20, G. Masek20, H. P. Paar20, D. M. Asner21, A. Eppich21, T. S. Hill21, R. J. Morrison21, R. A. Briere22, G. P. Chen22, T. Ferguson22, H. Vogel22, J. P. Alexander23, C. Bebek23, B. E. Berger23, K. Berkelman23, F. Blanc23, V. Boisvert23, D. G. Cassel23, P. S. Drell23, J. E. Duboscq23, K. M. Ecklund23, R. Ehrlich23, P. Gaidarev23, R. S. Galik23, L. Gibbons23, B. Gittelman23, S. W. Gray23, D. L. Hartill23, B. K. Heltsley23, L. Hsu23, C. D. Jones23, J. Kandaswamy23, D. L. Kreinick23, M. Lohner23, A. Magerkurth23, H. Mahlke-Krüger23, T. O. Meyer23, N. B. Mistry23, E. Nordberg23, M. Palmer23, J. R. Patterson23, D. Peterson23, D. Riley23, A. Romano23, H. Schwarthoff23, J. G. Thayer23, D. Urner23, B. Valant-Spaight23, G. Viehhauser23, A. Warburton23, P. Avery24, C. Prescott24, A. I. Rubiera24, H. Stoeck24, J. Yelton24, G. Brandenburg25, A. Ershov25, D. Y.-J. Kim25, and R. Wilson25 (CLEO Collaboration)
1University of Illinois, Urbana-Champaign, Illinois 61801
2aCarleton University, Ottawa, Ontario, Canada K1S 5B6
2band the Institute of Particle Physics, Canada
3Ithaca College, Ithaca, New York 14850
4University of Kansas, Lawrence, Kansas 66045
5University of Minnesota, Minneapolis, Minnesota 55455
6State University of New York at Albany, Albany, New York 12222
7The Ohio State University, Columbus, Ohio 43210
8University of Oklahoma, Norman, Oklahoma 73019
9University of Pittsburgh, Pittsburgh, Pennsylvania 15260
10Purdue University, West Lafayette, Indiana 47907
11University of Rochester, Rochester, New York 14627
12Southern Methodist University, Dallas, Texas 75275
13Syracuse University, Syracuse, New York 13244
14University of Texas, Austin, Texas 78712
15University of Texas–Pan American, Edinburg, Texas 78539
16Vanderbilt University, Nashville, Tennessee 37235
17Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
18Wayne State University, Detroit, Michigan 48202
19California Institute of Technology, Pasadena, California 91125
20University of California, San Diego, La Jolla, California 92093
21University of California, Santa Barbara, California 93106
22Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
23Cornell University, Ithaca, New York 14853
24University of Florida, Gainesville, Florida 32611
25Harvard University, Cambridge, Massachusetts 02138
Received 20 April 2001; published 24 July 2001
Using 12.7fb-1 of data collected with the CLEO detector at CESR, we observed two-photon production of the cc̅ states χc0 and χc2 in their decay to π+π-π+π-. We measured Γγγ(χc)×B(χc→π+π-π+π-) to be 75±13(stat)±8(syst)eV for the χc0 and 6.4±1.8(stat)±0.8(syst)eV for the χc2, implying Γγγ(χc0) = 3.76±0.65(stat)±0.41(syst)±1.69(br)keV and Γγγ(χc2) = 0.53±0.15(stat)±0.06(syst)±0.22(br)keV. Also, cancellation of dominant experimental and theoretical uncertainties permits a precise comparison of Γγγ(χc0)/Γγγ(χc2), evaluated to be 7.4±2.4(stat)±0.5(syst)±0.9(br), with QCD-based predictions.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.061801
DOI:
10.1103/PhysRevLett.87.061801
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