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@INPROCEEDINGS{Lange:292122,
      author       = {Lange, Sören},
      title        = {{XYZ} {S}tates - {R}esults from {E}xperiments},
      address      = {Hamburg},
      publisher    = {Deutsches Elektronen-Synchrotron, DESY},
      reportid     = {PUBDB-2015-05835, arXiv:1311.7594},
      pages        = {195-214},
      year         = {2014},
      abstract     = {Charmonium(-like) or bottomonium(-like) states, which are
                      incompatible with predictions from a static quark anti-quark
                      potential model, are often refered to as XYZ states. In this
                      lecture, some peculiar properties of states such as the
                      X(3872), the Y(4260), or the Zc(3900) are explained. Such
                      properties are utmost proximity to a threshold,
                      overpopulation of states, or possibly binding in the regime
                      of string breaking. Among decays, the surprising observation
                      of isospin violation, and using radiative decays for the
                      observation of a D-wave state is discussed. A second part of
                      the lecture presents recent precision measurements of masses
                      of newly observed bottomonium states. These masses can be
                      used for testing particular aspects of the potential, such
                      as test of the tensor term or test of the flavor
                      independence. At the end, an example is given, how future
                      experiments may be able to measure widths of a
                      charmonium(-like) state in the sub-MeV regime.},
      month         = {Jul},
      date          = {2013-07-15},
      organization  = {Helmholtz International School on
                       Physics of Heavy Quarks and Hadrons,
                       Dubna (Russia), 15 Jul 2013 - 28 Jul
                       2013},
      keywords     = {quark antiquark: potential model (INSPIRE) / quark
                      antiquark: static (INSPIRE) / isospin: violation (INSPIRE) /
                      charmonium: hadron spectroscopy (INSPIRE) / string model
                      (INSPIRE) / bottomonium: hadron spectroscopy (INSPIRE) /
                      quantum chromodynamics: perturbation theory (INSPIRE) /
                      nonrelativistic (INSPIRE) / upsilon mesons: radiative decay
                      (INSPIRE) / X(3872) (INSPIRE) / Y(4260) (INSPIRE) / B:
                      hadronic decay (INSPIRE) / experimental results (INSPIRE)},
      cin          = {L},
      cid          = {I:(DE-H253)L-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)HERA(machine)-20150101},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)15},
      eprint       = {1311.7594},
      howpublished = {arXiv:1311.7594},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1311.7594;\%\%$},
      doi          = {10.3204/DESY-PROC-2013-03/Lange},
      url          = {https://bib-pubdb1.desy.de/record/292122},
}