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The electromagnetic and gravitational form factors of $\Omega^-$, a spin-3/2hyperon composed of three $s$ quarks, are calculated by using a covariantquark-diquark approach. The model parameters are determined by fitting to theform factors of the lattice QCD calculations. Our obtained electromagneticradii, magnetic moment, and electric-quadrupole moment are in agreement withthe experimental measurements and some other model calculations. Furthermore,the mass and spin distributions of $\Omega^-$ from the gravitational formfactors are also displayed. It is found that the mass radius is smaller thanits electromagnetic ones. Finally, the interpretations of the energy densityand momentum current distribution are also discussed.

Form factors of $\Omega^-$ in a covariant quark-diquark approach