Meson Cloud Considerations in the Strange Magnetic Moment of the Nucleon from Lattice QCD

Charge symmetry between the light u and d quarks in octet baryons provides relations among various quark-sector contributions to baryon magnetic moments which may be used to gain information on the strange quark contribution to the nucleon magnetic moment, G_M^s (0). In analyzing these relations, it is important to consider the nonanalytic contributions to baryon magnetic moments arising from the meson cloud. In this report we consider both the π- and K-meson contributions to baryon magnetic moments. We find that the contribution from Ξ ->Σ /line K is large and plays a pivotal role in the final determination of G_M^s (0). With the inclusion of the /line K cloud, we find G_M^s (0) is definitely negative with G_M^s (0) = -0.4_-0.4^+0.2 μ _N.