@article{a3396950fec2455fa7478df82bb559cc,
title = "Amplitude analysis of the χc1 →ηπ+π- decays",
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.",
author = "\{(BESIII Collaboration)\} and M. Ablikim and Achasov, \{M. N.\} and S. Ahmed and Ai, \{X. C.\} and O. Albayrak and M. Albrecht and Ambrose, \{D. J.\} and A. Amoroso and An, \{F. F.\} and Q. An and Bai, \{J. Z.\} and O. Bakina and \{Baldini Ferroli\}, R. and Y. Ban and Bennett, \{D. W.\} and Bennett, \{J. V.\} and N. Berger and M. Bertani and D. Bettoni and Bian, \{J. M.\} and F. Bianchi and E. Boger and I. Boyko and Briere, \{R. A.\} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, \{G. F.\} and Cetin, \{S. A.\} and J. Chai and Chang, \{J. F.\} and G. Chelkov and G. Chen and Chen, \{H. S.\} and Chen, \{J. C.\} and Chen, \{M. L.\} and S. Chen and Chen, \{S. J.\} and X. Chen and Chen, \{X. R.\} and Chen, \{Y. B.\} and Cheng, \{H. P.\} and Chu, \{X. K.\} and G. Cibinetto and Dai, \{H. L.\} and Dai, \{J. P.\} and A. Dbeyssi and D. Dedovich and Deng, \{Z. Y.\}",
note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = feb,
day = "13",
doi = "10.1103/PhysRevD.95.032002",
language = "English",
volume = "95",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "3",
}