Nature of the light scalar mesons

Details Nature of the light scalar mesons Nature of the light scalar mesons

2005-08-11

arxiv.org/abs/hep-ph/0508142v1

Phys.Rev.D72:034025,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 figure, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.72.034025

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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