Nucleon Axial Form Factor from Lattice QCD

Details Nucleon Axial Form Factor from Lattice QCD Nucleon Axial Form Factor from Lattice QCD

1993-05-27

arxiv.org/abs/hep-lat/9305025v1

Phys.Rev.D49:4755-4761,1994

Physics

High Energy Physics

High Energy Physics - Lattice

8 pages, 5 figures (included in part 2), UK/93-01

Scientific paper

10.1103/PhysRevD.49.4755

Results for the isovector axial form factors of the proton from a lattice QCD calculation are presented for both point-split and local currents. They are obtained on a quenched $16^{3} \times 24$ lattice at $\beta= 6.0$ with Wilson fermions for a range of quark masses from strange to charm. We determine the finite lattice renormalization for both the local and point-split currents of heavy quarks. Results extrapolated to the chiral limit show that the $q^2$ dependence of the axial form factor agrees reasonably well with experiment. The axial coupling constant $g_A$ calculated for the local and the point-split currents is about 6\% and 12\% smaller than the experimental value respectively.

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