Amplitude analyses of the decays χ c1→ηπ +π - and χ c1→η π +π -

G. S. Adams, J. Napolitano, K. M. Ecklund, J. Insler, H. Muramatsu, C. S. Park, L. J. Pearson, E. H. Thorndike, S. Ricciardi, C. Thomas, Marina Artuso, Steven Roy Blusk, R. Mountain, Tomasz Skwarnicki, Sheldon Stone, L. M. Zhang, G. Bonvicini, D. Cinabro, A. Lincoln, M. J. SmithP. 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, J. P. Alexander, D. G. Cassel, S. Das, R. Ehrlich, L. Gibbons, S. W. Gray, D. L. Hartill, 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, J. Libby, M. Kornicer, R. E. Mitchell, M. R. Shepherd, A. Szczepaniak, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, J. Hietala, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, T. Xiao, L. Martin, A. Powell, G. Wilkinson, J. Y. Ge, D. H. Miller, I. P J Shipsey, B. Xin

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22 Scopus citations


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.

Original languageEnglish (US)
Article number112009
JournalPhysical Review D
Issue number11
StatePublished - Dec 29 2011


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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. R., Mountain, R., Skwarnicki, T., Stone, S., Zhang, L. M., Bonvicini, G., Cinabro, D., Lincoln, A., ... Xin, B. (2011). Amplitude analyses of the decays χ c1→ηπ +π - and χ c1→η π +π - Physical Review D, 84(11), [112009].