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Scalar mesons and tetraquarks by means of lattice QCD

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arxiv 1212.1648 v1 pith:EQEFB6JA submitted 2012-12-07 hep-lat hep-ph

Scalar mesons and tetraquarks by means of 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 hep-ph
keywords mesonsscalarlatticeoperatorsallowchallengingcomponentdiagrams
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the light scalar mesons a_0(980) and kappa using N_f = 2+1+1 flavor lattice QCD. In order to probe the internal structure of these scalar mesons, and in particular 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. The inclusion of disconnected diagrams, which are technically rather challenging, but which would allow us to extend our work to e.g. the f_0(980) meson, is introduced and discussed.

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