Two-photon width of the charmonium state χc2

S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, J. Ernst, K. Arms, H. Severini, S. A. Dytman, W. Love, S. Mehrabyan, J. A. Mueller, V. Savinov, Z. Li, A. Lopez, H. Mendez, J. Ramirez, G. S. Huang, D. H. Miller, V. PavluninB. Sanghi, I. P.J. Shipsey, G. S. Adams, M. Anderson, J. P. Cummings, I. Danko, J. Napolitano, Q. He, H. Muramatsu, C. S. Park, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, M. Artuso, C. Boulahouache, S. Blusk, J. Butt, O. Dorjkhaidav, J. Li, N. Menaa, R. Mountain, K. Randrianarivony, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, S. E. Csorna, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, A. Bornheim, S. P. Pappas, A. J. Weinstein, R. A. Briere, G. P. Chen, J. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, J. L. Rosner, N. E. Adam, J. P. Alexander, K. Berkelman, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, C. D. Jones, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, H. Mahlke-Krüger, T. O. Meyer, P. U.E. Onyisi, J. R. Patterson, D. Peterson, E. A. Phillips, J. Pivarski, D. Riley, A. Ryd, A. J. Sadoff, H. Schwarthoff, X. Shi, M. R. Shepherd, S. Stroiney, W. M. Sun, T. Wilksen, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, R. Patel, V. Potlia, H. Stoeck, J. Yelton, P. Rubin, C. Cawlfield, B. I. Eisenstein, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen, E. J. White, J. Williams, J. Wiss, D. M. Asner, K. W. Edwards, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, D. T. Gong, J. Hietala, Y. Kubota, T. Klein, B. W. Lang, S. Z. Li, R. Poling, A. W. Scott, A. Smith

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The two-photon width of χc2(P23) state of charmonium has been measured using 14.4fb-1 of e+e- data taken at s=9.46-11.30GeV 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 p̄p→χc2→γγ measurement, when they are both reevaluated using the recent CLEO result for the radiative decay χc2→γJ/ψ.

Original languageEnglish (US)
Article number071101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume73
Issue number7
DOIs
StatePublished - Apr 12 2006

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Zweber, P., Ernst, J., Arms, K., Severini, H., Dytman, S. A., Love, W., Mehrabyan, S., Mueller, J. A., Savinov, V., Li, Z., Lopez, A., Mendez, H., Ramirez, J., Huang, G. S., Miller, D. H., ... Smith, A. (2006). Two-photon width of the charmonium state χc2. Physical Review D - Particles, Fields, Gravitation and Cosmology, 73(7), [071101]. https://doi.org/10.1103/PhysRevD.73.071101