We study light scalar mesons with particular focus on the a0(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.
Wagner, M., Alexandrou, C., Daldrop, J., Dalla Brida, M., Gravina, M., Scorzato, L., et al. (2013). Scalar mesons and tetraquarks from twisted mass lattice QCD. Intervento presentato a: 5th Workshop on Excited QCD 2013, Sarajevo, Bosnia-Herzegovina [10.5506/APhysPolBSupp.6.847].
Scalar mesons and tetraquarks from twisted mass lattice QCD
Dalla Brida, MMembro del Collaboration Group
;
2013
Abstract
We study light scalar mesons with particular focus on the a0(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.
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Acta Phys.Polon.Supp. 6 (2013) no.3, 847-852.pdf
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