Power Counting Regime of Chiral Extrapolation and Beyond.

Leinweber, D. B. ; Thomas, A. W. ; Young, R. D.

Technical Information Center Oak Ridge Tennessee

关键词: Extrapolation;    Chirality;    Perturbation theory;    Quantum chromodynamics;    Pions;   

RP-ID  :  DE2005850375

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Finite-range regularized 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 0 (le) m(sub (pi)) (le) 180 MeV for the PCR, extending only a small distance beyond the physical pion mass.