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@ARTICLE{Hanhart:888619,
      author       = {Hanhart, Christoph and Klempt, Eberhard},
      title        = {{A}re the {XYZ} states unconventional states or
                      conventional states with unconventional properties?},
      journal      = {International journal of modern physics / A},
      volume       = {35},
      number       = {05},
      issn         = {1793-656X},
      address      = {Singapur},
      publisher    = {World Scientific Publ.},
      reportid     = {FZJ-2020-05071},
      pages        = {2050019 -},
      year         = {2020},
      abstract     = {We discuss three possible scenarios for the interpretation
                      of mesons containing a heavy quark and its antiquark near
                      and above the first threshold for a decay into a pair of
                      heavy mesons in a relative S-wave. View I assumes that these
                      thresholds force the quark potential to flatten which
                      implies that while in these energy ranges molecular states
                      may be formed, there should not be any quark–antiquark
                      states above these thresholds. View II assumes that the main
                      part of the interaction between two mesons is due to the
                      poles which originate from the QQ̄ interaction. The
                      properties of the QQ̄ mesons are strongly influenced by
                      opening thresholds but the number of states is given by the
                      quark model. In View III, both types of mesons are admitted
                      also near and above the open flavor thresholds: QQ̄ mesons
                      and dynamically generated mesons. Experimental consequences
                      of these different views are discussed.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
                      Strukturbildung in der Quantenchromodynamik (196253076)},
      pid          = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000519759400003},
      doi          = {10.1142/S0217751X20500190},
      url          = {https://juser.fz-juelich.de/record/888619},
}