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Nature of the light scalar mesons

J. Vijande·A. Valcarce·F. Fernandez·B. Silvestre-Brac
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Abstract

Despite the apparent simplicity of meson spectroscopy, light scalar mesons cannot be accommodated in the usual $q\bar q$ 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 $q\bar q$ 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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J. Vijande, A. Valcarce, F. Fernandez, B. Silvestre-Brac. 2005-08-11. Nature of the light scalar mesons. https://doi.org/10.1103/physrevd.72.034025

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