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Nature of the light scalar mesons

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Publication Date
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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]
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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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