Scalar mesons and tetraquarks from twisted mass lattice QCD
Date
2013Author
Wagner, M.Alexandrou, Constantia
Daldrop, J. O.
Brida, M. D.
Gravina, M.
Scorzato, L.
Urbach, C.
Wiese, C.
ISSN
1899-2358Source
Acta Physica Polonica B, Proceedings SupplementVolume
6Issue
3Pages
847-852Google Scholar check
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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.