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Double-J/ψ system in the spotlight of recent LHCb data

by V. Baru, X.-K. Dong, F.-K. Guo, C. Hanhart, A. Nefediev, B.-S. Zou

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Submission summary

Authors (as registered SciPost users): Alexey Nefediev
Submission information
Preprint Link: scipost_202202_00022v1  (pdf)
Date accepted: 2022-05-06
Date submitted: 2022-02-10 18:49
Submitted by: Nefediev, Alexey
Submitted to: SciPost Physics Proceedings
Proceedings issue: XXXIII International Workshop on High Energy Physics (IWHEP2021)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Phenomenological


Recently the LHCb Collaboration announced intriguing results on the double-$J/\psi$ production in proton-proton collisions. A coupled-channel interpretation of the measured di-$J/\psi$ spectrum is presented and a possible nature of the proposed near-threshold state $X(6200)$ is discussed.

Published as SciPost Phys. Proc. 6, 007 (2022)

Reports on this Submission

Anonymous Report 1 on 2022-3-30 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:scipost_202202_00022v1, delivered 2022-03-30, doi: 10.21468/SciPost.Report.4822


Phenomenological importance of this study consists in finding significant ($5\sigma$) evidence for the existence of a resonant structure (X(6200)) in double $J/\psi$ system. The authors analyzed scattering data over the range $6.2<M_X<7.2$ GeV, where a very thorough model-dependent analysis is needed. The authors performed a scrupulous analysis in a minimalistic approach using a couple-channel model and found that X(6200) is more like a $J/\psi-J/\psi$ molecule rather than a tetraquark and estimated the interaction potential in $J/\psi-J/\psi$ systems as well as chromopolarizability. It should also be noticed that this study involves a phenomenological request to compute heavy-quarkonia scattering amplitude on a lattice.

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