Study of ψ(2S) decays to γpp̄, π0pp̄, and ηpp̄, and search for pp̄ threshold enhancements

Date Issued
05-11-2010
Author(s)
Alexander, J. P.
Cassel, D. G.
Das, S.
Ehrlich, R.
Fields, L.
Gibbons, L.
Gray, S. W.
Hartill, D. L.
Heltsley, B. K.
Kreinick, D. L.
Kuznetsov, V. E.
Patterson, J. R.
Peterson, D.
Riley, D.
Ryd, A.
Sadoff, A. J.
Shi, X.
Sun, W. M.
Yelton, J.
Rubin, P.
Lowrey, N.
Mehrabyan, S.
Selen, M.
Wiss, J.
Indian Institute of Technology, Madras
Kornicer, M.
Mitchell, R. E.
Shepherd, M. R.
Tarbert, C. M.
Besson, D.
Pedlar, T. K.
Xavier, J.
Cronin-Hennessy, D.
Hietala, J.
Zweber, P.
Dobbs, S.
Metreveli, Z.
Seth, K. K.
Tomaradze, A.
Xiao, T.
Brisbane, S.
Martin, L.
Powell, A.
Spradlin, P.
Wilkinson, G.
Mendez, H.
Ge, J. Y.
Miller, D. H.
Shipsey, I. P.J.
Xin, B.
Adams, G. S.
Hu, D.
Moziak, B.
Napolitano, J.
Ecklund, K. M.
Insler, J.
Muramatsu, H.
Park, C. S.
Pearson, L. J.
Thorndike, E. H.
Yang, F.
Ricciardi, S.
Thomas, C.
Artuso, M.
Blusk, S.
Mountain, R.
Skwarnicki, T.
Stone, S.
Wang, J. C.
Zhang, L. M.
Bonvicini, G.
Cinabro, D.
Lincoln, A.
Smith, M. J.
Zhou, P.
Zhu, J.
Naik, P.
Rademacker, J.
Asner, D. M.
Edwards, K. W.
Randrianarivony, K.
Tatishvili, G.
Briere, R. A.
Vogel, H.
Onyisi, P. U.E.
Rosner, J. L.
DOI
Abstract
The decays of ψ(2S) into γpp̄, π0pp̄, and ηpp̄ have been studied with the CLEO-c detector using a sample of 24.5×106 ψ(2S) events obtained from e⊃+e⊃- annihilations at √s=3686MeV. The data show evidence for the excitation of several N⊃* resonances in pπ0 and pη channels in π0pp̄ and ηpp̄ decays, and f2 states in γpp̄ decay. Branching fractions for decays of ψ(2S) to γpp̄, π0pp̄, and ηpp̄ have been determined. No evidence for pp̄ threshold enhancements was found in the reactions ψ(2S)→Xpp̄, where X=γ, π0, η. We do, however, find confirming evidence for a pp̄ threshold enhancement in J/ψ→γpp̄ as previously reported by BES. © 2010 The American Physical Society.
Volume
82