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Johan Bijnens
Chiral perturbation theory in the meson sector
Abstract
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 $K\to2\pi$.
LU TP 09-25
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