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Scalar mesons and tetraquarks from twisted mass lattice QCD

We study light scalar mesons with particular focus on the a_0(980) using lattice QCD with 2+1+1 dynamical quark flavors. To investigate the structure of these scalar mesons and to identify, whether a sizeable tetraquark component is present, we use a large set of operators, including diquark-antidiquark, mesonic molecule and two-meson operators. We find that the low-lying states overlap essentially exclusively with two-meson states. This indicates that in the channels investigated no tightly bound four-quark states of either molecular or diquark-antidiquark type exist.

preprint2013arXivOpen access
Marc WagnerConstantia AlexandrouJan Oliver DaldropMattia Dalla BridaMario GravinaLuigi ScorzatoCarsten UrbachChristian Wiese
hep-lat
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Marc WagnerConstantia AlexandrouJan Oliver DaldropMattia Dalla BridaMario GravinaLuigi ScorzatoCarsten UrbachChristian Wiese

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