PHYSICAL REVIEW D VOLUME 50, NUMBER 7 1 OCTOBER 1994 Measurement of two-photon production of the y, 2 J. Dominick, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, P. Zadorozhny, M ArtusQ& D He 7 M Goldberg~ N Horwitz ~ R Kennett ~ G C MQnet j) F Muheimy Y Mukhiny S. Playfer, Y. Rozen, S. Stone, M. Thulasidas, G. Vasseur, G. Zhu, J. Bartelt, S. E. Csorna, Z. Egyed, V. Jain, 3 P. Sheldon, 3 D. S. Akerib, 4 B. Barish, 4 M. Chadha, 4 S. Chan, 4 D. F. Cowen, 4 G. Eigen, 4 J. S. Miller, 4 C. O' Grady, J. Urheim, A. J. Weinstein, D. Acosta, M. Athanas, G. Masek, H. Paar, M. Sivertz, A. Bean, J. Gronberg, R. Kutschke, S. Menary, R. J. Morrison, 6 S. Nakanishi, H. N. Nelson, T. K. Nelson, J. D. Richman, A. Ryd, 6 H. Tajima, D. Schmidt, D. Sperka, M. S. Witherell, M. Procario, S. Yang, R. Balest, K. Cho, M. Daoudi) W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner) P. Rankin, J. G. Smith, J. P. Alexander, C. Bebek, K. Berkelman, D. Besson, T. E. Browder, D. G. Cassel, H. A. Cho, e D. M. CofFman, s P. S. Drell, s R. Ehrlich, s R. S. Galik, M. Garcia-Sciveres, B. Geiser, B. Gittelman, s S. W. Gray, 9 D. L. Hartill, B. K. Heltsley, e C. D. Jones, 9 S. L. Jones, 9 J. Kandaswamy, N. Katayama, 9 P. C. Kim, D. L. Kreinick, G. S. Ludwig, J. Masui, 9 J. Mevissen, N. B. Mistry, 9 C. R. Ng, 9 E. Nordberg, M. Ogg, 9" J. R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, @ H. Wprden, F. Wurthwein, P. Avery, A. Freyberger, J. Rodriguez, R. Stephens, J. Yelton, D. Cinabro, S. Henderson, K. Kinoshita T. Liu M. Saulnier F. Shen R. Wilson H. Yamamotp ~ B. Ong M. Sel A. J. Sado', R. Ammar, 4 S. Ball, P. Baringer, D. Coppage, 4 N. Copty, R. Davis, N. Hancock, M. Kelly, N. Kwak, H. Lam, Y. Kubota, M. Lattery, J. K. Nelspn, S. Pattpn, D. PerticQne, R Poling 5 V. Savinov S. Schrenk R. Wang M. S. Alam I J. Kim B. Nemati J. J. O' Neill, 6 H. Severini, C. R. Sun, M. M. Zoeller, G. Crawford, M. Daubenmeir, R. Fulton, D. Fujinp K. K. Gan K. Honscheid H. Kagan R. Kass J. Lee R. Malchow F. Mprrpw Y. Skovpen, ' M. Sung, C. White, J. Whitmore, P. Wilson, F. Butler, X. Fu, G. Kalbaeisch, M. Lambrecht 8 W. R. Ross 8 P. Skubic J. Snow 8 P. L. Wang M. Wood 8 D. Bortoletto 9 D. N. Brown J. Fast R. L. McIlwain T. Miao D H. Miller M. Modesitt S. F. SchafFner s E. I. Shibata I. P. J. Shipsey 9 P. N. Wang M. Battle J. Ernst H. Kroha S. Roberts K. Sparks E. H. Thorndike and C. H. Wang (CLEO Collaboration) Southern Methodist University, Dallas, Texas 75875 Syracuse University, Syracuse, New York 1$8$$ Vanderbilt University, Nashville, Tennessee 37235 California Institute of Technology, Pasadena, Califorma 91195 University of California, San Diego, La Jolla, California 98093 University of California, Santa Barbara, Calfornia 93106 Carnegie-Mellon University, Pittsburgh, Pennsylvania 15823 University of Colorado, Boulder, Colorado 80309 0$90- Cornell University, Ithaca, New York 1/853 University of Florida, Gainesville, Florida 38611 Harvard University, Cambridge, Massachusetts 08138 University of Illinois, Champaign Urbana, Illinois -61801 Ithaca College, Ithaca, New York 1/850 University of Kansas, Lawrence, Kansas 660)5 University of Minnesota, Minneapolis, Minnesota 55/55 State Umversity of ¹wYork at Albany, Albany, New York 19889 Ohio State University, Columbus, Ohio $3810 University of Oklahoma, Norman, Oklahoma 73019 Purdue Umversity, West Lafayette, Indiana $7907 University of Rochester, Rochester, New York 1)687 (Received 4 October 1993; revised manuscript received 22 February 1994) The CLEO II detector is used to search for the production of y q states in two-photon interactions. We use the signature y, q ~ pJi@ ~ pl+1 with l = e, p. Using 1. 49 fb of data taken with beam energies near 5. 29 GeV, the two-photon width of the y s is determined to be I'(y, 2 -+ pp) 1. 08 + 0.30(stat) + 0. 26(syst) keV, in agreement with predictions from perturbative +CD. PACS number(s): 14.40. Gx, 13. 20.Gd, 13. 40. Hq, 13. 65.+i Permanent address: Carleton University, Ottawa, Canada K1S 586. Permanent address: INP, Novosibirsk, Russia. 0556-2821/94/50(7)/4265(7)/$06. 00 50 4265 1994 The American Physical Society