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.