This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevLett.126.132001 in citations.
Please use the identifier: http://hdl.handle.net/2128/27647 in citations.
Coupled-Channel Interpretation of the LHCb Double- J / ψ Spectrum and Hints of a New State Near the J / ψ J / ψ Threshold
Coupled-Channel Interpretation of the LHCb Double- J / ψ Spectrum and Hints of a New State Near the J / ψ J / ψ Threshold
Recently, the LHCb Collaboration reported pronounced structures in the invariant mass spectrum of J/ψ pairs produced in proton-proton collisions at the Large Hadron Collider. In this Letter, we argue that the data can be very well described within two variants of a coupled-channel approach employing...
Saved in:
Personal Name(s): | Dong, Xiang-Kun (Corresponding author) |
---|---|
Baru, Vadim / Guo, Feng-Kun (Corresponding author) / Hanhart, Christoph / Nefediev, Alexey | |
Contributing Institute: |
Theorie der Starken Wechselwirkung; IAS-4 Theorie der starken Wechselwirkung; IKP-3 |
Published in: | Physical review letters, 126 (2021) 13, S. 132001 |
Imprint: |
College Park, Md.
APS
2021
|
DOI: |
10.1103/PhysRevLett.126.132001 |
Document Type: |
Journal Article |
Research Program: |
TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik Enabling Computational- & Data-Intensive Science and Engineering |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/27647 in citations.
Recently, the LHCb Collaboration reported pronounced structures in the invariant mass spectrum of J/ψ pairs produced in proton-proton collisions at the Large Hadron Collider. In this Letter, we argue that the data can be very well described within two variants of a coupled-channel approach employing T matrices consistent with unitarity: (i) with just two channels, J/ψJ/ψ and ψ(2S)J/ψ, as long as energy-dependent interactions in these channels are allowed, or (ii) with three channels J/ψJ/ψ, ψ(2S)J/ψ, and ψ(3770)J/ψ with just constant contact interactions. Both formulations hint at the existence of a near-threshold state in the J/ψJ/ψ system with the quantum numbers JPC=0++ or 2++, which we refer to as X(6200). We suggest experimental tests to check the existence of this state and discuss what additional channels need to be studied experimentally to allow for distinctive tests between the two mechanisms proposed. If the molecular nature of X(6200), as hinted by the three-channel approach, is confirmed, many other double-quarkonium states should exist driven by the same binding mechanism. In particular, there should be an ηcηc molecule with a similar binding energy. |