Phys. Rev. Lett.
101,
101801
(2008)
[5 pages]
Observation of J/ψ→3γ
G. S. Adams et al. CLEO Collaboration
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G. S. Adams1, M. Anderson1, J. P. Cummings1, I. Danko1, D. Hu1, B. Moziak1, J. Napolitano1, Q. He2, J. Insler2, H. Muramatsu2, C. S. Park2, E. H. Thorndike2, F. Yang2, M. Artuso3, S. Blusk3, S. Khalil3, J. Li3, R. Mountain3, S. Nisar3, K. Randrianarivony3, N. Sultana3, T. Skwarnicki3, S. Stone3, J. C. Wang3, L. M. Zhang3, G. Bonvicini4, D. Cinabro4, M. Dubrovin4, A. Lincoln4, P. Naik5, J. Rademacker5, D. M. Asner6, K. W. Edwards6, J. Reed6, R. A. Briere7, T. Ferguson7, J. S. Y. Ma7,*, G. Tatishvili7, H. Vogel7, M. E. Watkins7, J. L. Rosner8, J. P. Alexander9, D. G. Cassel9, J. E. Duboscq9,†, R. Ehrlich9, L. Fields9, R. S. Galik9, L. Gibbons9, R. Gray9, S. W. Gray9, D. L. Hartill9, B. K. Heltsley9, D. Hertz9, J. M. Hunt9, J. Kandaswamy9, D. L. Kreinick9, V. E. Kuznetsov9, J. Ledoux9, H. Mahlke-Krüger9, D. Mohapatra9, P. U. E. Onyisi9, J. R. Patterson9, D. Peterson9, D. Riley9, A. Ryd9, A. J. Sadoff9, X. Shi9, S. Stroiney9, W. M. Sun9, T. Wilksen9, S. B. Athar10, R. Patel10, J. Yelton10, P. Rubin11, B. I. Eisenstein12, I. Karliner12, S. Mehrabyan12, N. Lowrey12, M. Selen12, E. J. White12, J. Wiss12, R. E. Mitchell13, M. R. Shepherd13, D. Besson14, T. K. Pedlar15, D. Cronin-Hennessy16, K. Y. Gao16, J. Hietala16, Y. Kubota16, T. Klein16, B. W. Lang16, R. Poling16, A. W. Scott16, P. Zweber16, S. Dobbs17, Z. Metreveli17, K. K. Seth17, A. Tomaradze17, J. Libby18, A. Powell18, G. Wilkinson18, K. M. Ecklund19, W. Love20, V. Savinov20, H. Mendez21, J. Y. Ge22, D. H. Miller22, I. P. J. Shipsey22, and B. Xin22 (CLEO Collaboration)
1Rensselaer Polytechnic Institute, Troy, New York 12180, USA
2University of Rochester, Rochester, New York 14627, USA
3Syracuse University, Syracuse, New York 13244, USA
4Wayne State University, Detroit, Michigan 48202, USA
5University of Bristol, Bristol BS8 1TL, United Kingdom
6Carleton University, Ottawa, Ontario, Canada K1S 5B6
7Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
8Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
9Cornell University, Ithaca, New York 14853, USA
10University of Florida, Gainesville, Florida 32611, USA
11George Mason University, Fairfax, Virginia 22030, USA
12University of Illinois, Urbana-Champaign, Illinois 61801, USA
13Indiana University, Bloomington, Indiana 47405, USA
14University of Kansas, Lawrence, Kansas 66045, USA
15Luther College, Decorah, Iowa 52101, USA
16University of Minnesota, Minneapolis, Minnesota 55455, USA
17Northwestern University, Evanston, Illinois 60208, USA
18University of Oxford, Oxford OX1 3RH, United Kingdom
19State University of New York at Buffalo, Buffalo, New York 14260, USA
20University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
21University of Puerto Rico, Mayaguez, Puerto Rico 00681
22Purdue University, West Lafayette, Indiana 47907, USA
Received 3 June 2008; published 2 September 2008
We report the first observation of the decay J/ψ→3γ. The signal has a statistical significance of 6σ and corresponds to a branching fraction of B(J/ψ→3γ)=(1.2±0.3±0.2)×10-5, in which the errors are statistical and systematic, respectively. The measurement uses ψ(2S)→π+π-J/ψ events acquired with the CLEO-c detector operating at the CESR e+e- collider.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.101801
DOI:
10.1103/PhysRevLett.101.101801
*Present address: Department of Physics, University of Texas, Austin, TX 78712, USA. †Deceased.
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