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Amplitude analysis of the $χ_{c1} \to ηπ^+π^-$ decays

Published in 2016 by Medina Ablikim, Mikhail N. Achasov, Samer Ali Nasher Ahmed, Xiaocong Ai, Onur Albayrak, Malte Albrecht, Daniel Ambrose, Antonio Amoroso, Fenfen An, Qi An, Jingzhi Bai, Olga Bakina, Rinaldo Baldini Ferroli, Yong Ban, Dan Bennett and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Using $448.0 \times 10^6$~$ψ(3686)$ events collected with the BESIII detector, an amplitude analysis is performed for $ψ(3686)\toγχ_{c1}$, $χ_{c1}\toηπ^+π^-$ decays. The most dominant two-body structure observed is $a_0(980)^{±}π^{∓}$; $a_0(980)^{±}\toηπ^{±}$. The $a_0(980)$ line shape is modeled using a dispersion relation, and a significant non-zero $a_0(980)$ coupling to the $η^{\prime}π$ channel is measured. We observe $χ_{c1}\to a_2(1700)π$ production for the first time, with a significance larger than 17$σ$. The production of mesons with exotic quantum numbers, $J^{PC}=1^{-+}$, is investigated, and upper limits for the branching fractions $χ_{c1}\to π_1(1400)^{±}π^{∓}$, $χ_{c1}\to π_1(1600)^{±}π^{∓}$, and $χ_{c1}\toπ_1(2015)^{±}π^{∓}$, with subsequent $π_1(X)^{±} \to ηπ^{±}$ decay, are determined.