Lattice calculation of the strangeness magnetic moment of the nucleon

We report on a lattice QCD calculation of the strangeness magnetic moment of the nucleon. Our result is (Formula presented). The sea contributions from the u and d quarks are about 80% larger. However, they cancel to a large extent due to their electric charges, resulting in a smaller net sea contribution of (Formula presented) to the nucleon magnetic moment. As far as the neutron to proton magnetic moment ratio is concerned, this sea contribution tends to cancel out the cloud-quark effect from the (Formula presented) graphs and results in a ratio of (Formula presented) which is close to the SU(6) relation and the experiment. The strangeness Sachs electric mean-square radius (Formula presented) is found to be small and negative.