Phys. Rev. D
79,
111101(R)
(2009)
[6 pages]
Charmonium decays to γπ0, γη, and γη′
T. K. Pedlar et al. CLEO Collaboration
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T. K. Pedlar1, J. Xavier1, D. Cronin-Hennessy2, K. Y. Gao2, J. Hietala2, T. Klein2, R. Poling2, P. Zweber2, S. Dobbs3, Z. Metreveli3, K. K. Seth3, B. J. Y. Tan3, A. Tomaradze3, J. Libby4, L. Martin4, A. Powell4, C. Thomas4, G. Wilkinson4, H. Mendez5, J. Y. Ge6, D. H. Miller6, I. P. J. Shipsey6, B. Xin6, G. S. Adams7, D. Hu7, B. Moziak7, J. Napolitano7, K. M. Ecklund8, Q. He9, J. Insler9, H. Muramatsu9, C. S. Park9, E. H. Thorndike9, F. Yang9, M. Artuso10, S. Blusk10, S. Khalil10, R. Mountain10, K. Randrianarivony10, T. Skwarnicki10, S. Stone10, J. C. Wang10, L. M. Zhang10, G. Bonvicini11, D. Cinabro11, M. Dubrovin11, A. Lincoln11, M. J. Smith11, P. Zhou11, J. Zhu11, P. Naik12, J. Rademacker12, D. M. Asner13, K. W. Edwards13, J. Reed13, A. N. Robichaud13, G. Tatishvili13, E. J. White13, R. A. Briere14, H. Vogel14, P. U. E. Onyisi15, J. L. Rosner15, J. P. Alexander16, D. G. Cassel16, R. Ehrlich16, L. Fields16, R. S. Galik16, L. Gibbons16, R. Gray16, S. W. Gray16, D. L. Hartill16, B. K. Heltsley16, D. Hertz16, J. M. Hunt16, J. Kandaswamy16, D. L. Kreinick16, V. E. Kuznetsov16, J. Ledoux16, H. Mahlke-Krüger16, J. R. Patterson16, D. Peterson16, D. Riley16, A. Ryd16, A. J. Sadoff16, X. Shi16, S. Stroiney16, W. M. Sun16, T. Wilksen16, J. Yelton17, P. Rubin18, N. Lowrey19, S. Mehrabyan19, M. Selen19, J. Wiss19, M. Kornicer20, R. E. Mitchell20, M. R. Shepherd20, C. Tarbert20, and D. Besson21 (CLEO Collaboration)
1Luther College, Decorah, Iowa 52101, USA
2University of Minnesota, Minneapolis, Minnesota 55455, USA
3Northwestern University, Evanston, Illinois 60208, USA
4University of Oxford, Oxford OX1 3RH, United Kingdom
5University of Puerto Rico, Mayaguez, Puerto Rico 00681
6Purdue University, West Lafayette, Indiana 47907, USA
7Rensselaer Polytechnic Institute, Troy, New York 12180, USA
8Rice University, Houston, Texas 77005, USA
9University of Rochester, Rochester, New York 14627, USA
10Syracuse University, Syracuse, New York 13244, USA
11Wayne State University, Detroit, Michigan 48202, USA
12University of Bristol, Bristol BS8 1TL, United Kingdom
13Carleton University, Ottawa, Ontario, Canada K1S 5B6
14Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
15Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
16Cornell University, Ithaca, New York 14853, USA
17University of Florida, Gainesville, Florida 32611, USA
18George Mason University, Fairfax, Virginia 22030, USA
19University of Illinois, Urbana-Champaign, Illinois 61801, USA
20Indiana University, Bloomington, Indiana 47405, USA
21University of Kansas, Lawrence, Kansas 66045, USA
Received 8 April 2009; published 5 June 2009
Using data acquired with the CLEO-c detector at the CESR e+e- collider, we measure branching fractions for J/ψ, ψ(2S), and ψ(3770) decays to γπ0, γη, and γη′. Defining Rn≡B[ψ(nS)→γη]/B[ψ(nS)→γη′], we obtain R1=(21.1±0.9)% and, unexpectedly, an order of magnitude smaller limit, R2<1.8% at 90% C.L. We also use J/ψ→γη′ events to determine branching fractions of improved precision for the five most copious η′ decay modes.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.111101
DOI:
10.1103/PhysRevD.79.111101
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