Journal Article

FZJ-2026-02062

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Decoding the structure near the π + π − mass threshold in ψ ( 3686 ) → J / ψ π + π − decays

Chen, Y.-H. (Corresponding author) ; Dong, X.-K. ; Guo, F.-K. ; Hanhart, C.FZJ* ; Kubis, B.

2026
American Physical Society Ridge, NY

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Please use a persistent id in citations: doi:10.1103/r5lz-864p  doi:10.34734/FZJ-2026-02062

Abstract: In light of recent high-precision data taken by the BESIII Collaboration, we reconsider the dipion transition 𝜓⁡(3686) →𝐽/𝜓⁡𝜋+⁢𝜋−. The strong pion-pion final-state interactions are taken into account model independently by using dispersion theory. We find that we can reproduce the substructure near the 𝜋+⁢𝜋−threshold observed experimentally without introducing an extra resonance state. While a helicity-flip amplitude plays an important role for the formation of the dip in the invariant-mass distribution, the virtual exchange of the charmoniumlike exotic 𝑍𝑐⁡(3900)state improves the fit quality only slightly.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)

Research Program(s):

1. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)

Appears in the scientific report 2026

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Database coverage:
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