Nucleon axial form-factor from lattice QCD

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

doi:10.1103/PhysRevD.49.4755

Nucleon axial form-factor from lattice QCD

Dec, 1992

13 pages

Published in:

Phys.Rev.D 49 (1994) 4755-4761

e-Print:

hep-lat/9305025 [hep-lat]

DOI:

10.1103/PhysRevD.49.4755

Report number:

UK-93-01

View in:

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Abstract:

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.

p: form factor
form factor: p
form factor: axial
axial: form factor
fermion: lattice field theory
approximation: quenching
gauge field theory: SU(3)
renormalization
quark: mass
mass: quark

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