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28 March 2024 |
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Article overview
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Coupled-channel interpretation of the LHCb double-$J/ψ$ spectrum and hints of a new state near $J/ψJ/ψ$ threshold | Xiang-Kun Dong
; Vadim Baru
; Feng-Kun Guo
; Christoph Hanhart
; Alexey Nefediev
; | Date: |
16 Sep 2020 | Abstract: | Recently, the LHCb Collaboration reported pronounced structures in the
invariant mass spectrum of $J/psi$-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 unitary coupled-channel approach:
(i) with just two channels, $J/psi J/psi$ and $psi(2S)J/psi$, as long as
energy-dependent interactions in these channels are allowed, or (ii) with three
channels $J/psi J/psi$, $psi(2S)J/psi$ and $psi(3770)J/psi$ with just
constant contact interactions. Both formulations hint at the existence of a
near-threshold state in the $J/psi J/psi$ system with the quantum numbers
$J^{PC}=0^{++}$ 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 the
$X(6200)$, as hinted by the three-channel approach, were confirmed, many other
double-quarkonium states should exist driven by the same binding mechanisms. | Source: | arXiv, 2009.07795 | Services: | Forum | Review | PDF | Favorites |
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