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

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

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 interpr...

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Bibliographic Details
Main Authors: Collaboration, CLEO, Adams, G, Napolitano, J, Ecklund, K, Insler, J, Muramatsu, H, Park, C, Pearson, L, Thorndike, E, Ricciardi, S, Thomas, C, Artuso, M, Blusk, S, Mountain, R, Skwarnicki, T, Stone, S, Zhang, L, Bonvicini, G, Cinabro, D, Lincoln, A, Smith, M, Zhou, P, Zhu, J, Naik, P, Rademacker, J
Format: Journal article
Language:English
Published: 2011
Description
Summary: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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