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New look at scalar mesons.

L Maiani1, F Piccinini, A D Polosa

  • 1Università di Roma La Sapienza, INFN, Rome, Italy. luciano.maiani@roma1.infn.it

Physical Review Letters
|December 17, 2004
PubMed
Summary

Light scalar mesons align with a diquark-antidiquark model, explaining their mass patterns and decays. This framework predicts new narrow, exotic states involving heavy quarks like charm and beauty.

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • Hadron Spectroscopy

Background:

  • Scalar mesons are fundamental particles in quantum chromodynamics.
  • Understanding their structure is key to comprehending the strong nuclear force.
  • Existing models struggle to fully explain scalar meson properties.

Purpose of the Study:

  • To investigate the diquark-antidiquark model for light scalar mesons.
  • To test the model's ability to reproduce observed mass formulas and decay patterns.
  • To predict properties of heavier exotic mesons.

Main Methods:

  • Applying the diquark-antidiquark description to light scalar meson nonets.
  • Utilizing mass formulas that incorporate the Okubo-Zweig-Iizuka (OZI) rule.
  • Modeling strong decays via a single amplitude for quark-antiquark pair annihilation.

Main Results:

  • The diquark-antidiquark model provides a good fit for light scalar meson masses.
  • The model successfully reproduces mass formulas respecting the Okubo-Zweig-Iizuka (OZI) rule.
  • Strong decays are reasonably explained by the quark-antiquark pair-switching mechanism.

Conclusions:

  • The diquark-antidiquark picture is a viable description for light scalar mesons.
  • This model offers a unified approach to understanding their spectroscopy and decays.
  • Predictions for exotic heavy states suggest observable narrow resonances.

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