Phys. Rev. Lett.
84,
26–30
(2000)
Search for Rare and Forbidden η′ Decays
R. A. Briere et al. (CLEO Collaboration)
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R. A. Briere1, B. H. Behrens2, W. T. Ford2, A. Gritsan2, H. Krieg2, J. Roy2, J. G. Smith2, J. P. Alexander3, R. Baker3, C. Bebek3, B. E. Berger3, K. Berkelman3, F. Blanc3, V. Boisvert3, D. G. Cassel3, M. Dickson3, S. von Dombrowski3, P. S. Drell3, K. M. Ecklund3, R. Ehrlich3, A. D. Foland3, P. Gaidarev3, R. S. Galik3, L. Gibbons3, B. Gittelman3, S. W. Gray3, D. L. Hartill3, B. K. Heltsley3, P. I. Hopman3, C. D. Jones3, D. L. Kreinick3, T. Lee3, Y. Liu3, T. O. Meyer3, N. B. Mistry3, C. R. Ng3, E. Nordberg3, J. R. Patterson3, D. Peterson3, D. Riley3, J. G. Thayer3, P. G. Thies3, B. Valant-Spaight3, A. Warburton3, P. Avery4, M. Lohner4, C. Prescott4, A. I. Rubiera4, J. Yelton4, J. Zheng4, G. Brandenburg5, A. Ershov5, Y. S. Gao5, D. Y.-J. Kim5, R. Wilson5, T. E. Browder6, Y. Li6, J. L. Rodriguez6, H. Yamamoto6, T. Bergfeld7, B. I. Eisenstein7, J. Ernst7, G. E. Gladding7, G. D. Gollin7, R. M. Hans7, E. Johnson7, I. Karliner7, M. A. Marsh7, M. Palmer7, C. Plager7, C. Sedlack7, M. Selen7, J. J. Thaler7, J. Williams7, K. W. Edwards8a,8b, R. Janicek9a,9b, P. M. Patel9a,9b, A. J. Sadoff10, R. Ammar11, P. Baringer11, A. Bean11, D. Besson11, D. Coppage11, R. Davis11, S. Kotov11, I. Kravchenko11, N. Kwak11, X. Zhao11, S. Anderson12, V. V. Frolov12, Y. Kubota12, S. J. Lee12, R. Mahapatra12, J. J. O'Neill12, R. Poling12, T. Riehle12, A. Smith12, S. Ahmed13, M. S. Alam13, S. B. Athar13, L. Jian13, L. Ling13, A. H. Mahmood13, M. Saleem13, S. Timm13, F. Wappler13, A. Anastassov14, J. E. Duboscq14, K. K. Gan14, C. Gwon14, T. Hart14, K. Honscheid14, H. Kagan14, R. Kass14, J. Lorenc14, H. Schwarthoff14, M. B. Spencer14, E. von Toerne14, M. M. Zoeller14, S. J. Richichi15, H. Severini15, P. Skubic15, A. Undrus15, M. Bishai16, S. Chen16, J. Fast16, J. W. Hinson16, J. Lee16, N. Menon16, D. H. Miller16, E. I. Shibata16, I. P. J. Shipsey16, Y. Kwon17,*, A. L. Lyon17, E. H. Thorndike17, C. P. Jessop18, K. Lingel18, H. Marsiske18, M. L. Perl18, V. Savinov18, D. Ugolini18, X. Zhou18, T. E. Coan19, V. Fadeyev19, I. Korolkov19, Y. Maravin19, I. Narsky19, R. Stroynowski19, J. Ye19, T. Wlodek19, M. Artuso20, R. Ayad20, E. Dambasuren20, S. Kopp20, G. Majumder20, G. C. Moneti20, R. Mountain20, S. Schuh20, T. Skwarnicki20, S. Stone20, A. Titov20, G. Viehhauser20, J. C. Wang20, A. Wolf20, J. Wu20, S. E. Csorna21, K. W. McLean21, S. Marka21, Z. Xu21, R. Godang22, K. Kinoshita22,†, I. C. Lai22, P. Pomianowski22, S. Schrenk22, G. Bonvicini23, D. Cinabro23, R. Greene23, L. P. Perera23, G. J. Zhou23, S. Chan24, G. Eigen24, E. Lipeles24, M. Schmidtler24, A. Shapiro24, W. M. Sun24, J. Urheim24, A. J. Weinstein24, F. Würthwein24, D. E. Jaffe25, G. Masek25, H. P. Paar25, E. M. Potter25, S. Prell25, V. Sharma25, D. M. Asner26, A. Eppich26, J. Gronberg26, T. S. Hill26, D. J. Lange26, R. J. Morrison26, T. K. Nelson26, J. D. Richman26, and D. Roberts26 (CLEO Collaboration)
1Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
2University of Colorado, Boulder, Colorado 80309-0390
3Cornell University, Ithaca, New York 14853
4University of Florida, Gainesville, Florida 32611
5Harvard University, Cambridge, Massachusetts 02138
6University of Hawaii at Manoa, Honolulu, Hawaii 96822
7University of Illinois, Urbana-Champaign, Illinois 61801
8aCarleton University, Ottawa, Ontario, Canada K1S 5B6
8band the Institute of Particle Physics, Canada
9aMcGill University, Montréal, Québec, Canada H3A 2T8
9band the Institute of Particle Physics, Canada
10Ithaca College, Ithaca, New York 14850
11University of Kansas, Lawrence, Kansas 66045
12University of Minnesota, Minneapolis, Minnesota 55455
13State University of New York at Albany, Albany, New York 12222
14Ohio State University, Columbus, Ohio 43210
15University of Oklahoma, Norman, Oklahoma 73019
16Purdue University, West Lafayette, Indiana 47907
17University of Rochester, Rochester, New York 14627
18Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
19Southern Methodist University, Dallas, Texas 75275
20Syracuse University, Syracuse, New York 13244
21Vanderbilt University, Nashville, Tennessee 37235
22Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
23Wayne State University, Detroit, Michigan 48202
24California Institute of Technology, Pasadena, California 91125
25University of California, San Diego, La Jolla, California 92093
26University of California, Santa Barbara, California 93106
Received 22 July 1999; revised 4 November 1999; published in the issue dated 3 January 2000
We have searched for rare and forbidden decays of the η′ meson in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb-1 of e+e- collisions at 10.6 GeV center-of-mass energy at the Cornell Electron Storage Ring. We find no signals, and set 90% confidence level upper limits of their branching fractions: B(η′→e+e-η)<2.4×10-3, B(η′→e+e-π0)<1.4×10-3, B(η′→e+e-γ)<0.9×10-3, and B(η′→eμ)<4.7×10-4. We also fit the matrix element of the η′→π+π-η Dalitz plot with the parametrization |M|2 = A|1+αy|2, where y is a linear function of the kinetic energy of the η, and find Re (α) = -0.021±0.025.
© 2000 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.26
DOI:
10.1103/PhysRevLett.84.26
PACS:
14.40.Cs, 11.30.Er, 13.40.Hq
*Permanent address: Yonsei University, Seoul 120-749, Korea. †Permanent address: University of Cincinnati, Cincinnati, OH 45221.
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