Lattice calculation of the magnetic moments of Δ and Ω- baryons with dynamical clover fermions

We calculate the magnetic dipole moment of the Delta (1232) and Omega(-) baryons with 2 + 1 flavors of clover fermions on anisotropic lattices using a background magnetic field. This is the first dynamical calculation of these magnetic moments using a background field technique. The calculation for Omega(-) is done at the physical strange quark mass, with the result in units of the physical nuclear magneton mu(Omega-) = - 1.93 +/- 0: 08 +/- 0: 12 ( where the first error is statistical and the second is systematic) compared to the experimental number: - 2.02 +/- 0.05. The Delta has been studied at three unphysical quark masses, corresponding to pion mass m(pi) = 366, 438, and 548 MeV. The pion mass dependence is compared with the behavior obtained from chiral effective field theory.