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 a(980)+-π∓; a(980)+- → ηπ+-. The a(980) line shape is modeled using a dispersion relation, and a significant nonzero a(980) coupling to the η0π 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 1⁄4 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.

Amplitude analysis of the χc1→ηπ+π− decays

FARINELLI, Riccardo;GARZIA, Isabella;MEZZADRI, Giulio;
2017

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 a(980)+-π∓; a(980)+- → ηπ+-. The a(980) line shape is modeled using a dispersion relation, and a significant nonzero a(980) coupling to the η0π 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 1⁄4 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.
2017
Ablikim, M.; Achasov, M.  . n.; Ahmed, S.; Ai, X.  . c.; Albayrak, O.; Albrecht, M.; Ambrose, D.  . j.; Amoroso, A.; An, F.  . f.; An, Q.; Bai, J.  . ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2369496
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