Amplitude analysis of the χc1 →ηπ+π- decays

M. Ablikim, M. N. Achasov, S. Ahmed, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, O. Bakina, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. V. Bennett, N. Berger, M. Bertani, D. Bettoni, J. M. BianF. Bianchi, E. Boger, I. Boyko, R. A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. Chai, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, G. Cibinetto, H. L. Dai, J. P. Dai, A. Dbeyssi, H. Muramatsu, R. Poling, (BESIII Collaboration)

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Abstract

Using 448.0×106 ψ(3686) events collected with the BESIII detector, an amplitude analysis is performed for ψ(3686)→γχc1, χc1→ηπ+π- decays. The most dominant two-body structure observed is a0(980)±π+; a0(980)±→ηπ±. The a0(980) line shape is modeled using a dispersion relation, and a significant nonzero a0(980) coupling to the η′π channel is measured. We observe χc1→a2(1700)π production for the first time, with a significance larger than 17σ. The production of mesons with exotic quantum numbers, JPC=1-+, is investigated, and upper limits for the branching fractions χc1→π1(1400)±π+, χc1→π1(1600)±π+, and χc1→π1(2015)±π+, with subsequent π1(X)±→ηπ± decay, are determined.

Original languageEnglish (US)
Article number032002
JournalPhysical Review D
Volume95
Issue number3
DOIs
StatePublished - Feb 13 2017

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Publisher Copyright:
© 2017 American Physical Society.

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