Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2010-01-07
Phys.Rev.D81:054502,2010
Physics
High Energy Physics
High Energy Physics - Lattice
22 pages, 7 figures, v2. discussion improved, some figures updated, results unchanged
Scientific paper
10.1103/PhysRevD.81.054502
Nucleon properties are investigated in background electric fields. As the magnetic moments of baryons affect their relativistic propagation in constant electric fields, electric polarizabilities cannot be determined without knowledge of magnetic moments. This is analogous to the experimental situation, for which determination of polarizabilities from the Compton amplitude requires subtraction of Born terms. With the background field method, we devise combinations of nucleon correlation functions in constant electric fields that isolate magnetic moments and electric polarizabilities. Using an ensemble of anisotropic gauge configurations with dynamical clover fermions, we demonstrate how both observables can be determined from lattice QCD simulations in background electric fields. We obtain results for the neutron and proton, however, our study is currently limited to electrically neutral sea quarks. The value we extract for the nucleon isovector magnetic moment is comparable to those obtained from measuring lattice three-point functions at similar pion masses.
Detmold William
Tiburzi Brian C.
Walker-Loud Andre
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