SU(2) chiral perturbation theory low-energy constants from staggered 2+1   flavor simulations
  We measure the pion mass and decay constant on ensembles generated by the Wuppertal-Budapest Collaboration, and extract the NLO low-energy constants l_3 and l_4 of SU(2) chiral perturbation theory. The data are generated in 2+1 flavor simulations with Symanzik glue and 2-fold stout-smeared staggered fermions, with pion masses varying from 135 MeV to 400 MeV, lattice scales between 0.7 GeV and 2.0 GeV, and m_s kept at its physical value. Furthermore, by excluding the lightest mass points, we are able to test the reliability of SU(2) chPT as a tool to extrapolate towards the physical point from higher pion masses. 
Enno E. Scholz, Szabolcs Borsanyi, Stephan Durr, Zoltan Fodor, Sandor   D. Katz, Stefan Krieg, Andreas Schafer, and Kalman K...
hep-lat hep-ph