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@ARTICLE{Dong:891527,
      author       = {Dong, Xiang-Kun and Baru, Vadim and Guo, Feng-Kun and
                      Hanhart, Christoph and Nefediev, Alexey},
      title        = {{C}oupled-{C}hannel {I}nterpretation of the {LHC}b
                      {D}ouble- {J} / ψ {S}pectrum and {H}ints of a {N}ew {S}tate
                      {N}ear the {J} / ψ {J} / ψ {T}hreshold},
      journal      = {Physical review letters},
      volume       = {126},
      number       = {13},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2021-01580},
      pages        = {132001},
      year         = {2021},
      abstract     = {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.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {511 - Enabling Computational- Data-Intensive Science and
                      Engineering (POF4-511) / DFG project 196253076 - TRR 110:
                      Symmetrien und Strukturbildung in der Quantenchromodynamik
                      (196253076)},
      pid          = {G:(DE-HGF)POF4-511 / G:(GEPRIS)196253076},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33861129},
      UT           = {WOS:000652826300004},
      doi          = {10.1103/PhysRevLett.126.132001},
      url          = {https://juser.fz-juelich.de/record/891527},
}