Light Scalar Mesons
Deirdre Black, Amir H. Fariborz, Joseph Schechter
TL;DR
This paper reviews evidence for light scalar mesons from chiral Lagrangian models of meson scattering and decay, suggesting their structure is closer to a dual quark-antiquark configuration and proposing mechanisms for higher mass scalars.
Contribution
It provides a comprehensive review of light scalar mesons using effective chiral Lagrangians and proposes a new structural interpretation and mechanisms for higher scalars.
Findings
Evidence for sigma(550) and kappa(900) mesons
Description of f0(980) and a0(980) mesons
Structural suggestion towards dual quark-antiquark configuration
Abstract
We review how a certain effective chiral Lagrangian approach to pi pi scattering, pi K scattering and eta-prime decay to eta pi pi provides evidence for the existence of light scalars sigma(550) and kappa(900) as well as describing the f0(980) and the a0(980). An attempt to fit these into a nonet suggests that their structure is closer to a dual quark-dual antiquark than to a quark-antiquark. A possible mechanism to explain the next higher mass scalar nonet is also proposed.
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