# Nature of the light scalar mesons

Authors
Publication Date
Source
HAL-IN2P3
Keywords
• Meson Mass
• Chiral Symmetries
• Lattice Field Theory
• Quantum Chromodynamics
• Sparticles
• Quark Confinement
• 12.39.-X, 12.38.-T
• [Phys.Hphe] Physics [Physics]/High Energy Physics - Phenomenology [Hep-Ph]
• [Phys.Nucl] Physics [Physics]/Nuclear Theory [Nucl-Th]
• [Phys.Hexp] Physics [Physics]/High Energy Physics - Experiment [Hep-Ex]
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.