出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The background field method has been used successfully to determine hadron electromagnetic
polarizabilities. Recently questions have been raised regarding the proper way to deal with the
electric field on the lattice. In this paper, we show how the presence of a background electric field
affects the quark hopping matrix. We use this formulation to carry out simulations on quenched
configurations, and we present the results for neutron electric polarizability for pion masses as
low as 500MeV. We find that the polarizability is roughly constant for the quark masses considered,
a 1.5×10−4 fm3. While the polarizability is positive, it is significantly smaller than the
experimental value due to the fact that the quark masses used are too large.
