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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

Mesonic Low-Energy Constants

Author

  • Johan Bijnens
  • Gerhard Ecker

Summary, in English

We review the status of the coupling constants of chiral Lagrangians in the meson sector, the so-called low-energy constants (LECs). We emphasize the chiral SU(2) and SU(3) Lagrangians for the strong interactions of light mesons and discuss the theoretical and experimental input for determining the corresponding LECs. In the two-flavor sector, we review the knowledge of the O(p(4)) LECs from both continuum fits and lattice QCD analyses. For chiral SU(3), next-to-next-to-leading-order (NNLO) effects play a much greater role. Our main new results are fits of the LECs L-i at both next-to-leading order (NLO) and NNLO, making extensive use of the available knowledge of NNLO LECs. We compare our results with available lattice determinations. We then discuss resonance saturation of LECs and the convergence of chiral SU(3) to NNLO. Finally, we review the status of predictions for the LECs of chiral Lagrangians with dynamical photons and leptons.

Department/s

  • Theoretical Particle Physics

Publishing year

2014

Language

English

Pages

149-174

Publication/Series

Annual Review of Nuclear and Particle Science

Volume

64

Document type

Journal article review

Publisher

Annual Reviews

Topic

  • Subatomic Physics

Keywords

  • chiral perturbation theory
  • low-energy constants
  • lattice QCD
  • resonance
  • saturation
  • dynamical photons and leptons

Status

Published

ISBN/ISSN/Other

  • ISSN: 1545-4134