Nucleon axial form factor from lattice QCD

K. F. Liu, S. J. Dong, T. Draper, J. M. Wu, W. Wilcox

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Results for the isovector axial form factors of the proton from a lattice QCD calculation are presented for both the point-split and local currents. They are obtained on a quenched 163 × 24 lattice at β=6.0 with Wilson fermions for a range of quark masses from strange to twice the charm mass. For each quark mass, we find that the axial form factor falls off slower than the corresponding proton electric form factor. Results extrapolated to the chiral limit show that the q2 dependence of the axial form factor agrees quite well with experiment. The axial vector coupling constant gA calculated for the point-split and local currents is 1.20 ± 0.11 and 1.18 ± 0.11. The central values are 4% and 6% smaller than the experimental value of 1.254, respectively. We also consider the large ma correction and renormalization for the axial vector current of heavy quarks.

Original languageEnglish
Pages (from-to)4755-4761
Number of pages7
JournalPhysical review D
Issue number9
StatePublished - 1994

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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