Extrapolation of lattice QCD results beyond the power-counting regime

Details Extrapolation of lattice QCD results beyond the power-counting regime Extrapolation of lattice QCD results beyond the power-counting regime

2005-01-27

arxiv.org/abs/hep-lat/0501028v2

Nucl.Phys.A755:59-70,2005

Physics

High Energy Physics

High Energy Physics - Lattice

12 pages, 5 figures, plenary talk at BARYONS 2004, Paris, Oct. 25-29

Scientific paper

10.1016/j.nuclphysa.2005.03.024

Resummation of the chiral expansion is necessary to make accurate contact with current lattice simulation results of full QCD. Resummation techniques including relativistic formulations of chiral effective field theory and finite-range regularization (FRR) techniques are reviewed, with an emphasis on using lattice simulation results to constrain the parameters of the chiral expansion. We illustrate how the chiral extrapolation problem has been solved and use FRR techniques to identify the power-counting regime (PCR) of chiral perturbation theory. To fourth-order in the expansion at the 1% tolerance level, we find 0 \le m_pi \le 0.18 GeV for the PCR, extending only a small distance beyond the physical pion mass.

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