Strange Magnetic Moment of The Nucleon from Lattice QCD

Abstract

We calculate the strange magnetic moment of the nucleon on a quenched $16^3\times 24$ lattice at $\beta =6.0$, and with Wilson fermions at $\kappa$ = 0.148, 0.152, and 0.154. The strange quark contribution from the disconnected insertion is estimated stochastically by employing the $Z_2$ noise method. Using an unbiased subtraction along with the help of charge conjugation and hermiticity, we reduce the error by a factor of 2 with negligible overhead. Our result is $G_M^s=-0.28\pm 0.10{\mu }_N$.

Comments: Lattice 2000 (Hadronic Matrix Elements), 4 pages 2 figs