Nature of the light scalar mesons

Nature of the light scalar mesons

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Nature of the light scalar mesons

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Vijande Asenjo, Javier; Valcarce Mejía, Alfredo; Fernández González, Francisco; Silvestre-Brac, B.
This document is a artículoDate2005

Despite the apparent simplicity of meson spectroscopy, light scalar mesons cannot be accommodated in the usual q (q) over bar structure. We study the description of the scalar mesons below 2 GeV in terms of the mixing of a chiral nonet of tetraquarks with conventional q (q) over bar states. A strong diquark-antidiquark component is found for several states. The consideration of a glueball as dictated by quenched lattice QCD drives a coherent picture of the isoscalar mesons.
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