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Power Counting Regime of Chiral Extrapolation and Beyond

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.

preprint2005arXivOpen access
Derek B. LeinweberAnthony W. ThomasRoss D. Young
hep-lat
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Derek B. LeinweberAnthony W. ThomasRoss D. Young

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