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Recent developments in the physics of light quarks
H. Leutwyler
My talk was dedicated to the memory of Jan Stern. The brief account given below focuses on the progress achieved in the determination of the S-wave scattering lengths, both ex…
On the low energy end of the QCD spectrum
H. Leutwyler
The energy gap of QCD is now understood very well. There is no doubt that the expansion in powers of the two lightest quark masses does represent a very useful tool for the analysi…
Physics of the light quarks
H. Leutwyler
These lecture notes concern recent developments in our understanding of the low energy properties of QCD. Significant progress has been made on the lattice and the beautiful experi…
Model independent determination of the sigma pole
H. Leutwyler
The first part of this report reviews recent developments at the interface between lattice work on QCD with light dynamical quarks, effective field theory and low energy precision…