Maarten Golterman

Chiral perturbation theory for the quenched approximation of QCD.

We describe a technique for constructing the effective chiral theory for quenched QCD. The effective theory which results is a Lagrangian one, with a graded symmetry group which mixes Goldstone bosons and fermions, and with a definite (though slightly peculiar) set of Feynman rules. The straightforward application of these rules gives automatic cancellation of diagrams which would arise from virtual quark loops. The techniques are used to calculate chiral logarithms in {ital f}{sub {ital K}}/{ital f}{sub {pi}}, {ital m}{sub {pi}}, {ital m}{sub {ital K}}, and the ratio of {l angle}{ital {bar s}s}{r angle} to {l angle}{ital {bar u}u}{r angle}. The leading finite-volume corrections to these quantities are also computed. Problems for future study are described.

Review of lattice results concerning low-energy particle physics: Flavour Lattice Averaging Group (FLAG)

We review lattice results related to pion, kaon, D- and B-meson physics with the aim of making them easily accessible to the particle-physics community. More specifically, we report on the determination of the light-quark masses, the form factor

Duality violations and spectral sum rules

f_+(0)

Chern-Simons currents and chiral fermions on the lattice

f+(0), arising in the semileptonic

Model-independent parametrization of the hadronic vacuum polarization and g -2 for the muon on the lattice

K \rightarrow \pi

Strong coupling from the revised ALEPH data for hadronic τ decays

K→π transition at zero momentum transfer, as well as the decay constant ratio