Phys. Rev. Lett.
82,
286–290
(1999)
First Observations of ϒ(1S)→γπ+π- and ϒ(1S)→γπ0π0
A. Anastassov et al. (CLEO Collaboration)
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A. Anastassov1, J. E. Duboscq1, K. K. Gan1, T. Hart1, K. Honscheid1, H. Kagan1, R. Kass1, J. Lee1, H. Schwarthoff1, A. Wolf1, M. M. Zoeller1, S. J. Richichi2, H. Severini2, P. Skubic2, A. Undrus2, M. Bishai3, S. Chen3, J. Fast3, J. W. Hinson3, N. Menon3, D. H. Miller3, E. I. Shibata3, I. P. J. Shipsey3, S. Glenn4, Y. Kwon4,*, A. L. Lyon4, S. Roberts4, E. H. Thorndike4, C. P. Jessop5, K. Lingel5, H. Marsiske5, M. L. Perl5, V. Savinov5, D. Ugolini5, X. Zhou5, T. E. Coan6, V. Fadeyev6, I. Korolkov6, Y. Maravin6, I. Narsky6, R. Stroynowski6, J. Ye6, T. Wlodek6, M. Artuso7, E. Dambasuren7, S. Kopp7, G. C. Moneti7, R. Mountain7, S. Schuh7, T. Skwarnicki7, S. Stone7, A. Titov7, G. Viehhauser7, J. C. Wang7, J. Bartelt8, S. E. Csorna8, K. W. McLean8, S. Marka8, Z. Xu8, R. Godang9, K. Kinoshita9, I. C. Lai9, P. Pomianowski9, S. Schrenk9, G. Bonvicini10, D. Cinabro10, R. Greene10, L. P. Perera10, G. J. Zhou10, S. Chan11, G. Eigen11, E. Lipeles11, J. S. Miller11, M. Schmidtler11, A. Shapiro11, W. M. Sun11, J. Urheim11, A. J. Weinstein11, F. Würthwein11, D. E. Jaffe12, G. Masek12, H. P. Paar12, E. M. Potter12, S. Prell12, V. Sharma12, D. M. Asner13, J. Gronberg13, T. S. Hill13, D. J. Lange13, R. J. Morrison13, H. N. Nelson13, T. K. Nelson13, D. Roberts13, B. H. Behrens14, W. T. Ford14, A. Gritsan14, H. Krieg14, J. Roy14, J. G. Smith14, J. P. Alexander15, R. Baker15, C. Bebek15, B. E. Berger15, K. Berkelman15, V. Boisvert15, D. G. Cassel15, D. S. Crowcroft15, M. Dickson15, S. von Dombrowski15, P. S. Drell15, K. M. Ecklund15, R. Ehrlich15, A. D. Foland15, P. Gaidarev15, R. S. Galik15, L. Gibbons15, B. Gittelman15, S. W. Gray15, D. L. Hartill15, B. K. Heltsley15, P. I. Hopman15, J. Kandaswamy15, D. L. Kreinick15, T. Lee15, Y. Liu15, N. B. Mistry15, C. R. Ng15, E. Nordberg15, M. Ogg15,†, J. R. Patterson15, D. Peterson15, D. Riley15, A. Soffer15, B. Valant-Spaight15, A. Warburton15, C. Ward15, M. Athanas16, P. Avery16, C. D. Jones16, M. Lohner16, C. Prescott16, A. I. Rubiera16, J. Yelton16, J. Zheng16, G. Brandenburg17, R. A. Briere17, A. Ershov17, Y. S. Gao17, D. Y.-J. Kim17, R. Wilson17, H. Yamamoto17, T. E. Browder18, Y. Li18, J. L. Rodriguez18, S. K. Sahu18, T. Bergfeld19, B. I. Eisenstein19, J. Ernst19, G. E. Gladding19, G. D. Gollin19, R. M. Hans19, E. Johnson19, I. Karliner19, M. A. Marsh19, M. Palmer19, M. Selen19, J. J. Thaler19, K. W. Edwards20, A. Bellerive21, R. Janicek21, P. M. Patel21, A. J. Sadoff22, R. Ammar23, P. Baringer23, A. Bean23, D. Besson23, D. Coppage23, C. Darling23, R. Davis23, S. Kotov23, I. Kravchenko23, N. Kwak23, L. Zhou23, S. Anderson24, Y. Kubota24, S. J. Lee24, R. Mahapatra24, J. J. O'Neill24, R. Poling24, T. Riehle24, A. Smith24, M. S. Alam25, S. B. Athar25, Z. Ling25, A. H. Mahmood25, S. Timm25, and F. Wappler25 (CLEO Collaboration)
1Ohio State University, Columbus, Ohio 43210
2University of Oklahoma, Norman, Oklahoma 73019
3Purdue University, West Lafayette, Indiana 47907
4University of Rochester, Rochester, New York 14627
5Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
6Southern Methodist University, Dallas, Texas 75275
7Syracuse University, Syracuse, New York 13244
8Vanderbilt University, Nashville, Tennessee 37235
9Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
10Wayne State University, Detroit, Michigan 48202
11California Institute of Technology, Pasadena, California 91125
12University of California, San Diego, La Jolla, California 92093
13University of California, Santa Barbara, California 93106
14University of Colorado, Boulder, Colorado 80309-0390
15Cornell University, Ithaca, New York 14853
16University of Florida, Gainesville, Florida 32611
17Harvard University, Cambridge, Massachusetts 02138
18University of Hawaii at Manoa, Honolulu, Hawaii 96822
19University of Illinois, Urbana-Champaign, Illinois 61801
20Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Montréal, Canada
21McGill University, Montréal, Québec, Canada H3A 2T8 and the Institute of Particle Physics, Montréal, Canada
22Ithaca College, Ithaca, New York 14850
23University of Kansas, Lawrence, Kansas 66045
24University of Minnesota, Minneapolis, Minnesota 55455
25State University of New York at Albany, Albany, New York 12222
Received 5 August 1998; published in the issue dated 11 January 1999
We report on a study of exclusive radiative decays of the ϒ(1S) resonance collected with the CLEO II detector operating at the Cornell Electron Storage Ring. We present the first observation of the radiative decays ϒ(1S)→γπ+π- and ϒ(1S)→γπ0π0. For the dipion mass regime mππ>1.0 GeV, we obtain B(ϒ(1S)→γπ+π-) = (6.3±1.2±1.3)×10-5 and B(ϒ(1S)→γπ0π0) = (1.7±0.6±0.3)×10-5.
© 1999 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.286
DOI:
10.1103/PhysRevLett.82.286
PACS:
13.40.Hq, 13.25.Gv, 13.87.Fh, 14.40.Gx
*Permanent address: Yonsei University, Seoul, 120-749, Korea. †Permanent address: University of Texas, Austin, TX 78712.
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