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Scalar mesons and tetraquarks from twisted mass lattice QCD

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arxiv 1302.3389 v1 pith:MKENSYT4 submitted 2013-02-14 hep-lat

Scalar mesons and tetraquarks from twisted mass lattice QCD

Marc Wagner , Constantia Alexandrou , Jan Oliver Daldrop , Mattia Dalla Brida , Mario Gravina , Luigi Scorzato , Carsten Urbach , Christian Wiese This is my paper
classification hep-lat
keywords mesonsscalarstatesdiquark-antidiquarklatticeoperatorstwo-mesonbound
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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