Phys. Rev. Lett.
87,
141801
(2001)
[4 pages]
Search for the Decay ϒ(1S)→γη′
S. J. Richichi et al. (CLEO Collaboration)
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S. J. Richichi1, H. Severini1, P. Skubic1, S. A. Dytman2, V. Savinov2, S. Chen3, J. W. Hinson3, J. Lee3, D. H. Miller3, E. I. Shibata3, I. P. J. Shipsey3, V. Pavlunin3, D. Cronin-Hennessy4, A. L. Lyon4, W. Park4, E. H. Thorndike4, T. E. Coan5, Y. S. Gao5, F. Liu5, Y. Maravin5, I. Narsky5, R. Stroynowski5, J. Ye5, M. Artuso6, C. Boulahouache6, K. Bukin6, E. Dambasuren6, G. Majumder6, R. Mountain6, T. Skwarnicki6, S. Stone6, J. C. Wang6, H. Zhao6, S. Kopp7, M. Kostin7, A. H. Mahmood8, S. E. Csorna9, I. Danko9, K. W. McLean9, Z. Xu9, R. Godang10, G. Bonvicini11, D. Cinabro11, M. Dubrovin11, S. McGee11, A. Bornheim12, E. Lipeles12, S. P. Pappas12, A. Shapiro12, W. M. Sun12, A. J. Weinstein12, D. E. Jaffe13, R. Mahapatra13, G. Masek13, H. P. Paar13, R. J. Morrison14, R. A. Briere15, G. P. Chen15, T. Ferguson15, H. Vogel15, J. P. Alexander16, C. Bebek16, K. Berkelman16, F. Blanc16, V. Boisvert16, D. G. Cassel16, P. S. Drell16, J. E. Duboscq16, K. M. Ecklund16, R. Ehrlich16, R. S. Galik16, L. Gibbons16, B. Gittelman16, S. W. Gray16, D. L. Hartill16, B. K. Heltsley16, L. Hsu16, C. D. Jones16, J. Kandaswamy16, D. L. Kreinick16, M. Lohner16, A. Magerkurth16, H. Mahlke-Krüger16, T. O. Meyer16, N. B. Mistry16, E. Nordberg16, M. Palmer16, J. R. Patterson16, D. Peterson16, J. Pivarski16, D. Riley16, H. Schwarthoff16, J. G. Thayer16, D. Urner16, B. Valant-Spaight16, G. Viehhauser16, A. Warburton16, M. Weinberger16, S. B. Athar17, P. Avery17, C. Prescott17, H. Stoeck17, J. Yelton17, G. Brandenburg18, A. Ershov18, D. Y.-J. Kim18, R. Wilson18, K. Benslama19, B. I. Eisenstein19, J. Ernst19, G. E. Gladding19, G. D. Gollin19, R. M. Hans19, I. Karliner19, N. A. Lowrey19, M. A. Marsh19, C. Plager19, C. Sedlack19, M. Selen19, J. J. Thaler19, J. Williams19, K. W. Edwards20a,20b, A. J. Sadoff21, R. Ammar22, A. Bean22, D. Besson22, X. Zhao22, S. Anderson23, V. V. Frolov23, Y. Kubota23, S. J. Lee23, R. Poling23, A. Smith23, C. J. Stepaniak23, J. Urheim23, S. Ahmed24, M. S. Alam24, L. Jian24, L. Ling24, M. Saleem24, S. Timm24, F. Wappler24, A. Anastassov25, E. Eckhart25, K. K. Gan25, C. Gwon25, T. Hart25, K. Honscheid25, D. Hufnagel25, H. Kagan25, R. Kass25, T. K. Pedlar25, J. B. Thayer25, E. von Toerne25, and M. M. Zoeller25 (CLEO Collaboration)
1University of Oklahoma, Norman, Oklahoma 73019
2University of Pittsburgh, Pittsburgh, Pennsylvania 15260
3Purdue University, West Lafayette, Indiana 47907
4University of Rochester, Rochester, New York 14627
5Southern Methodist University, Dallas, Texas 75275
6Syracuse University, Syracuse, New York 13244
7University of Texas, Austin, Texas 78712
8University of Texas–Pan American, Edinburg, Texas 78539
9Vanderbilt University, Nashville, Tennessee 37235
10Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
11Wayne State University, Detroit, Michigan 48202
12California Institute of Technology, Pasadena, California 91125
13University of California–San Diego, La Jolla, California 92093
14University of California, Santa Barbara, California 93106
15Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
16Cornell University, Ithaca, New York 14853
17University of Florida, Gainesville, Florida 32611
18Harvard University, Cambridge, Massachusetts 02138
19University of Illinois, Urbana-Champaign, Illinois, 61801
20aCarleton University, Ottawa, Ontario, Canada K1S 5B6
20band the Institute of Particle Physics, Canada
21Ithaca College, Ithaca, New York 14850
22University of Kansas, Lawrence, Kansas 66045
23University of Minnesota, Minneapolis, Minnesota 55455
24State University of New York at Albany, Albany, New York 12222
25The Ohio State University, Columbus, Ohio 43210
Received 10 July 2001; published 13 September 2001
We report on a search for the radiative decay ϒ(1S)→γη′ in 61.3pb-1 of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Three decay chains were investigated, all involving η′→π+π-η, followed by η→γγ, η→π0π0π0, or η→π+π-π0. We find no candidate events in any of the three cases and set a combined upper limit of 1.6×10-5 at 90% C.L., significantly smaller than the previous limit. We compare our result to other radiative ϒ decays, to radiative J/ψ decays, and to theoretical predictions.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.141801
DOI:
10.1103/PhysRevLett.87.141801
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