Scalar mesons and tetraquarks from twisted mass lattice QCD

Abstract

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.

6 pages, 1 figure, talk given at "Excited QCD 2013", February 3-9 2013, Bjelasnica Mountain, Sarajevo, Bosnia

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Cited by in corpus (5)

• Phenomenology of axial-vector and pseudovector mesons: decays and mixing in the kaonic sector
• Partial twisting for scalar mesons
• Investigation of light and heavy tetraquark candidates using lattice QCD
• Study of the a_0(980) on the lattice
• Studying $\kappa$ meson with a MILC fine lattice