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Amplitude analyses of the decays χ <inf>c1</inf>→ηπ <sup>+</sup>π <sup>-</sup> and χ <inf>c1</inf>→η <sup>′</sup>π <sup>+</sup>π <sup>-</sup>
Date Issued
29-12-2011
Author(s)
Adams, G. S.
Napolitano, J.
Ecklund, K. M.
Insler, J.
Muramatsu, H.
Park, C. S.
Pearson, L. J.
Thorndike, E. H.
Ricciardi, S.
Thomas, C.
Artuso, M.
Blusk, S.
Mountain, R.
Skwarnicki, T.
Stone, S.
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.
Alexander, J. P.
Cassel, D. G.
Das, S.
Ehrlich, R.
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.
Szczepaniak, A.
Besson, D.
Pedlar, T. K.
Cronin-Hennessy, D.
Hietala, J.
Dobbs, S.
Metreveli, Z.
Seth, K. K.
Tomaradze, A.
Xiao, T.
Martin, L.
Powell, A.
Wilkinson, G.
Ge, J. Y.
Miller, D. H.
Shipsey, I. P.J.
Xin, B.
Abstract
Using a data sample of 2.59×107 ψ(2S) decays obtained with the CLEO-c detector, we perform amplitude analyses of the complementary decay chains ψ(2S)→γχ c1; χ c1→ηπ +π - and ψ(2S)→γχ c1; χ c1→η ′π +π -. We find evidence for an exotic P-wave η ′π amplitude, which, if interpreted as a resonance, would have parameters consistent with the π 1(1600) state reported in other production mechanisms. We also make the first observation of the decay a 0(980) →η ′π and measure the ratio of branching fractions B(a 0(980)→η ′π)/B(a 0(980) →ηπ)=0.064±0.014±0.014. The ππ spectrum produced with a recoiling η is compared to that with η ′ recoil. © 2011 American Physical Society.
Volume
84