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@ARTICLE{Ali:393947,
      author       = {Ali, Ahmed and Lange, Jens Sören and Stone, Sheldon},
      title        = {{E}xotics: {H}eavy pentaquarks and tetraquarks},
      journal      = {Progress in particle and nuclear physics},
      volume       = {97},
      issn         = {0146-6410},
      address      = {Oxford [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PUBDB-2017-11774, DESY-17-071. arXiv:1706.00610},
      pages        = {123 - 198},
      year         = {2017},
      note         = {© Elsevier B.V.},
      abstract     = {For many decades after the invention of the quark model in
                      1964 there was no evidence that hadrons are formed from
                      anything other than the simplest pairings of quarks and
                      antiquarks, mesons being formed of a quark–antiquark pair
                      and baryons from three quarks. In the last decade, however,
                      in an explosion of data from both $e^{+}e^{-}$ and hadron
                      colliders, there are many recently observed states that do
                      not fit into this picture. These new particles are called
                      generically “exotics”. They can be either mesons or
                      baryons. Remarkably, they all decay into at least one meson
                      formed of either a $c\bar{c}$ or $b\bar{b}$ pair. In this
                      review, after the introduction, we explore each of these new
                      discoveries in detail first from an experimental point of
                      view, then subsequently give a theoretical discussion. These
                      exotics can be explained if the new mesons contain
                      two-quarks and two-antiquarks (tetraquarks), while the
                      baryons contain four-quarks plus an antiquark (pentaquarks).
                      The theoretical explanations for these states take three
                      divergent tracks: tightly bound objects, just as in the case
                      of normal hadrons, but with more constituents, or loosely
                      bound “molecules” similar to the deuteron, but formed
                      from two mesons, or a meson or baryon, or more wistfully,
                      they are not multiquark states but appear due to kinematic
                      effects caused by different rescatterings of virtual
                      particles; most of these models have all been post-dictions.
                      Both the tightly and loosely bound models predict the masses
                      and related quantum numbers of new, as yet undiscovered
                      states. Thus, future experimental discoveries are needed
                      along with theoretical advances to elucidate the structure
                      of these new exotic states.},
      cin          = {T},
      ddc          = {530},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611)},
      pid          = {G:(DE-HGF)POF3-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000414890100003},
      eprint       = {1706.00610},
      howpublished = {arXiv:1706.00610},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1706.00610;\%\%$},
      doi          = {10.1016/j.ppnp.2017.08.003},
      url          = {https://bib-pubdb1.desy.de/record/393947},
}