We present results on the Omega baryon electromagnetic form factors using Nf=2+1 domain-wall fermion configurations for three pion masses in the range of about 350 to 300 MeV. We compare results obtained using domain wall fermions with those of a mixed-action (hybrid) approach, which combine domain wall valence quarks on staggered sea quarks, for a pion mass of about 350 MeV. We pay particular attention in the evaluation of the subdominant electric quadrupole form factor to sufficient accuracy to exclude a zero value, by constructing a sequential source that isolates it from the dominant form factors. The Ω− magnetic moment, μΩ−, the electric charge and magnetic radius, ⟨rE0/M12⟩, are extracted for these pion masses. The electric quadrupole moment is determined for the first time using dynamical quarks.
@article{arxiv.1006.0558,
title = {The electromagnetic form factors of the Omega in lattice QCD},
author = {C. Alexandrou and T. Korzec and G. Koutsou and J. W. Negele and Y. Proestos},
journal= {arXiv preprint arXiv:1006.0558},
year = {2014}
}