Lattice QCD determination of the Wilson Chiral Perturbation Theory low-energy constant c2 on CLS lattices

by Dr John Bulava (NIC, Zeuthen)

Friday 21 Jan 2011, 11:00 → 12:00 Europe/Zurich

TH Theory Conference Room (CERN)

I will review a current effort within the ALPHA collaboration to determine the low energy constant c_2 from Wilson Chiral Perturbation Theory (WChPT) on CLS lattices. We employ a novel method that compares the ratio of single-pion and two-pion correlation functions on the lattice and in WChPT. Preliminary results obtained at a=0.9, 0.7 fm for pion masses down to 250MeV indicate that c_2*a^2 is small.