The background field method for measuring the electric polarizability of the neutron is adapted to the dynamical quark case, resulting in the calculation of (certain space-time integrals over) three- and four-point functions. Particular care is taken to disentangle polarizability effects from the effects of subjecting the neutron to a constant background gauge field; such a field is not a pure gauge on a finite lattice and engenders a mass shift of its own. At a pion mass of m_pi = 759 MeV, a small, slightly negative electric polarizability is found for the neutron.
@article{arxiv.0710.1888,
title = {Electric polarizability of the neutron in dynamical quark ensembles},
author = {Michael Engelhardt},
journal= {arXiv preprint arXiv:0710.1888},
year = {2009}
}
Comments
7 pages, 3 figures, talk presented at Lattice 2007 (Hadron Structure), July 30 - August 4, 2007, Regensburg, Germany