Physics Goals:
We propose to study static and quasi-static electromagnetic properties of hadrons in QCD using lattice methods with external fields in combination with effective field theory (EFT). We are carying out this proposal by making use of existing gauge fields with an external magnetic field that will determine the isovector magnetic moment of the nucleon, the isovector magnetic polarizability of the nucleon, and the magnetic polarizability of the pseudo-scalar mesons in full QCD. Preliminary investigations of the baryon spin polarizabilities will also be performed (these quantities provide a powerful test of chiral perturbation theory, as they are dominated by the anomalous &pi0-pole contribution). Our approach is to use partially-quenched QCD calculations with unphysical electromagnetic couplings to determine parameters in the relevant low-energy EFT, which are then used to make physical predictions. For a number of the processes we aim to study, greatly improved experimental measurements are expected in the next few years so we will be able to make timely predictions.