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Fitting strategies to extract the axial charge of the nucleon from lattice QCD
2014
Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 — PoS(LATTICE 2013)
unpublished
We report on a comparison of several fit methods used for the extraction of the nucleon axial charge g A from lattice QCD with two dynamical flavours of O(a) improved Wilson quarks. We use plateau fits, summed operator insertions (the summation method) and a new "midpoint" method to investigate contributions from excited states that affect the determination of g A . We also present a method to perform correlated fits when the standard estimator for the inverse of the covariance matrix becomes unstable.
doi:10.22323/1.187.0446
fatcat:a72lvfcvybfx7pecmpj7am4khq