Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1992-05-21
Phys.Rev.D46:1109-1122,1992
Physics
High Energy Physics
High Energy Physics - Lattice
32 pages, figures not currently attached
Scientific paper
10.1103/PhysRevD.46.1109
We calculate electric and magnetic form factors of protons and neutrons in quenched Monte Carlo lattice QCD on a $16^3\times 24$ lattice at $\beta = 6.0$ using Wilson fermions. We employ a method which characterizes one of the nucleon fields as a fixed zero-momentum secondary source. Extrapolating the overall data set to the chiral limit, we find acceptable fits for either dipole or monopole forms and extract proton and neutron magnetic moments, the magnitude of which are $10$ to $15\%$ low compared to experiment. In the extrapolation of the dipole fit of the form factors, we find that the dipole to nucleon mass ratio is about $7\%$ low compared to experiment. In addition, we obtain positive values of the neutron electric form factor, which, however, are poorly represented by a popular phenomenological form at intermediate to small $\kappa$ values. A zero-momentum technique for extracting hadron magnetic moments is briefly discussed and shown to yield unrealistically small magnetic moment values.
Draper Terrence
Liu Keh-Fei
Wilcox Walter
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