Electric Polarizability In Lattice QCD

We study the electric polarizability of neutral and charged particles using lattice QCD techniques with standard Wilson fermions. The background field method is used for introducing the electric field onto the lattice. The calculations are carried out using quenched configurations with 6 different pion masses and 4 different fields. The polarizabilites are extracted from small mass shifts. The charged particles are more challenging than neutral particles because they accelerate in the electric field. We investigate several methods for isolating the signal for charged particles. The methods are checked by using test data generated from the known functional form of the two- point correlation function for charged scalar particles [1]. We will report results for a variety of mesons and baryons. \\[4pt] [1] W. Detmold, B.C. Tiburzi, A. Walker-Loud, Phys. Rev D79 094505 (2009)