Laurent Lellouch
Speaker affiliation: 
Centre de Physique Théorique, Marseille, CNRS and Aix-Marseille U.
Friday, November 29, 2013 - 16:15
Building 44 (Shackleton) Lect. Theatre B (1057)
Lattice QCD at the physical point meets SU(2) chiral perturbation theory

SU(2) chiral perturbation theory (ChPT) is a nonrenormalizable
effective field theory that is widely used to describe the low-energy
properties and dynamics of QCD. For many years ChPT was also used to
compensate for the shortcomings of lattice QCD computations. Today,
thanks to the tremendous progress of such computations, lattice QCD
can help test and constrain ChPT. I will show how this can be done
using state-of-the-art lattice QCD calculations of the pion mass and
decay constant. Performed at four values of the lattice spacing and
all the way down to the physical value of the pion mass and even
below, these calculations allow to explore the range of applicability
of SU(2) ChPT and to determine fundamental properties of QCD encoded
by some of ChPT's low-energy constants.