Progress in chiral perturbation theory

Abstract

After a short status report on chiral perturbation theory, I review recent progress in determining some of the low-energy couplings by matching the effective theory to QCD. Consequences for K_{l3} decays and for the extraction of the CKM matrix element V_{us} are reported. Hadronic vacuum polarization at low energies and its impact on the anomalous magnetic moment of the muon are discussed.

Comments: 10 pages, to appear in Proc. of QCD@Work, Conversano, Italy, June 2005