Power Counting Regime of Chiral Extrapolation and Beyond
arXiv:hep-lat/0510070
Abstract
Finite-range regularised (FRR) chiral effective field theory is presented in the context of approximation schemes ubiquitous in modern lattice QCD calculations. Using FRR techniques, the power-counting regime (PCR) of chiral perturbation theory can be estimated. To fourth-order in the expansion at the 1% tolerance level, we find m_π< 180 MeV for the PCR, extending only a small distance beyond the physical pion mass.
Lattice 2005 (hadron spectrum and quark masses), 6 pages, 2 figures