Recent developments in the physics of light quarks

Details Recent developments in the physics of light quarks Recent developments in the physics of light quarks

2008-12-22

arxiv.org/abs/0812.4165v1

PoS Confinement8:068,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contribution to Proc. Confinement and the Hadron Spectrum VIII, Mainz, Germany, Sept. 1-6, 2008

Scientific paper

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 $\pi\pi$ S-wave scattering lengths, both experimentally and with light dynamical quarks on a lattice. In view of the excellent agreement, we can conclude that (a) the expansion in powers of the two lightest quark masses represents a very efficient tool for the analysis of the low energy structure of QCD and (b) the size of the energy gap of QCD is governed by the order parameter of lowest dimension, the quark condensate.

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