Johan Bijnens
Chiral Meson Physics at Two Loops

7 pages, Invited plenary talk presented at the 19th European Few-Body conference, Groningen, The Netherlands, August 23-27, 2004

An overview of Chiral Perturbation Theory calculations in the mesonic sector at the two Loop level is given. Discussed in some detail are the partially quenched case relevant for lattice QCD, the general fitting procedures and $\pi\pi$,$\pi K$ scattering as well as the determination of $V_{us}$ and $K_{\ell3}$ decays.

LU TP 04-30, hep-ph/0409068