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arXiv · 1109.5843

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·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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Abstract

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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CLEO Collaboration, 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, 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. 2011-09-27. Amplitude analyses of the decays chi_c1 -> eta pi+ pi- and chi_c1 -> eta' pi+ pi-. https://doi.org/10.1103/physrevd.84.112009

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