Journal Article

FZJ-2021-03781

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Is the existence of a J / ψ J / ψ bound state plausible?

Dong, X.-K. ; Baru, V. ; Guo, F.-K. (Corresponding author) ; Hanhart, C.FZJ* ; Nefediev, A. ; Zou, B.-S.

2021
Science China Press [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/29351  doi:10.1016/j.scib.2021.09.009

Abstract: In a recent measurement LHCb reported pronounced structures in the spectrum. One of the various possible explanations of those is that they emerge from non-perturbative interactions of vector charmonia. It is thus important to understand whether it is possible to form a bound state of two charmonia interacting through the exchange of gluons, which hadronise into two pions at the longest distance. In this paper, we demonstrate that, given our current understanding of hadron-hadron interactions, the exchange of correlated light mesons (pions and kaons) is able to provide sizeable attraction to the di- system, and it is possible for two mesons to form a bound state. As a side result we find from an analysis of the data for the transition including both and final state interactions an improved value for the transition chromo-electric polarisability: , where the uncertainty also includes the one induced by the final state interactions.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 5111 - Domain-Specific Simulation Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2021

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