Amplitude analysis of the
χ c 1 → η π + π −
decays
Physical Review D(2017)
摘要
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.Received 11 October 2016DOI:https://doi.org/10.1103/PhysRevD.95.032002© 2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionHadronic decaysParticle interactionsNuclear PhysicsParticles & Fields
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关键词
amplitude analysis,decays,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml
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