Chiral perturbation theory in the meson sector

Details Chiral perturbation theory in the meson sector Chiral perturbation theory in the meson sector

2009-09-25

arxiv.org/abs/0909.4635v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages

Scientific paper

The present status of Chiral Perturbation Theory in the meson sector is discussed concentrating on recent developments. This write-up contains short discussions on a listing a few historical papers, the principles behind ChPT, two-flavour ChPT including some comments about the pion polarizability, three-flavour ChPT with a discussion of the recently found relations as tests of ChPT and preliminary results of a new fit of the NLO low-energy-constants (LECs). It discusses somewhat deeper $\eta\to3\pi$ and the arguments for the existence of a ``hard pion ChPT'' and its application to $K\to2\pi$.

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