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arxiv 1109.5843 v2 pith:M4OLCZZ6 submitted 2011-09-27 hep-ex

Amplitude analyses of the decays chi_c1 -> eta pi+ pi- and chi_c1 -> eta' pi+ pi-

CLEO Collaboration: G. S. Adams , J. Napolitano , K. M. Ecklund , J. Insler , H. Muramatsu , C. S. Park , L. J. Pearson , E. H. Thorndike
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S. Ricciardi C. Thomas M. Artuso S. Blusk R. Mountain T. Skwarnicki S. Stone 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 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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classification hep-ex
keywords amplitudeanalysesdecaydecaysbranchingchainscleo-ccompared
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using a data sample of 2.59 x 10^7 psi(2S) decays obtained with the CLEO-c detector, we perform amplitude analyses of the complementary decay chains chi_c1 -> eta pi+ pi- and chi_c1 -> eta' pi+ pi-. We find evidence for a P-wave eta' pi scattering amplitude, which, if interpreted as a resonance, would have exotic J^PC = 1^-+ and parameters consistent with the pi_1(1600) state reported in other production mechanisms. We also make the first observation of the decay a_0(980) -> eta' pi and measure the ratio of branching fractions B(a_0(980) -> eta' pi)/B(a_0(980) -> eta pi) = 0.064 +- 0.014 +- 0.014. The pi pi spectrum produced with a recoiling eta is compared to that with eta' recoil.

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  1. Study of $\chi_{cJ}\to \eta \eta \eta^\prime$ via intermediate charmed meson loop mechanisms and its implications for non-observation of $\eta_1(1855)$ in $\chi_{cJ}$ decays

    hep-ph 2026-04 unverdicted novelty 4.0

    Charmed-meson loop calculations reproduce the branching fractions of chi_cJ to eta eta eta' and the absence of eta1(1855) signal in the eta eta' spectrum.