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arxiv 1007.2886 v2 pith:MHSUKWTA submitted 2010-07-16 hep-ex

Study of psi(2S) Decays to gamma p bar{p}, pi⁰ p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements

CLEO Collaboration: J. P. Alexander , D. G. Cassel , S. Das , R. Ehrlich , L. Fields , L. Gibbons , S. W. Gray , D. L. Hartill
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B. K. Heltsley D. L. Kreinick V. E. Kuznetsov J. R. Patterson D. Peterson D. Riley A. Ryd A. J. Sadoff X. Shi W. M. Sun J. Yelton P. Rubin N. Lowrey S. Mehrabyan M. Selen J. Wiss S. Adams M. Kornicer R. E. Mitchell M. R. Shepherd C. M. Tarbert D. Besson T. K. Pedlar J. Xavier D. Cronin-Hennessy J. Hietala P. Zweber S. Dobbs Z. Metreveli K. K. Seth A. Tomaradze T. Xiao S. Brisbane J. Libby L. Martin A. Powell P. Spradlin G. Wilkinson H. Mendez J. Y. Ge D. H. Miller I. P. J. Shipsey B. Xin G. S. Adams D. Hu B. Moziak J. Napolitano K. M. Ecklund J. Insler H. Muramatsu C. S. Park L. J. Pearson E. H. Thorndike F. Yang S. Ricciardi C. Thomas M. Artuso S. Blusk R. Mountain T. Skwarnicki S. Stone J. C. Wang L. M. Zhang G. Bonvicini D. Cinabro A. Lincoln M. J. Smith P. Zhou J. Zhu P. Naik J. Rademacker D. M. Asner K. W. Edwards K. Randrianarivony G. Tatishvili R. A. Briere H. Vogel P. U. E. Onyisi J. L. Rosner
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classification hep-ex
keywords gammadecaysevidencethresholdbeenenhancementsannihilationsbranching
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been studied with the CLEO-c detector using a sample of 24.5 million psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The data show evidence for the excitation of several N^* resonances in p pi^0 and p eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p} threshold enhancements was found in the reactions psi(2S)-> X p bar{p}, where X = gamma, pi^0, eta. We do, however, find confirming evidence for a p bar{p} threshold enhancement in J/psi-> gamma p bar{p} as previously reported by BES.

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