Electromagnetic form factors of the Ω− baryon in the spacelike and timelike regions

We present complete calculations of the electromagnetic form factors $\Omega^-$ in spacelike region and timelike region. The four elastic factors: electric charge ($G_{E0}$), magnetic dipole ($G_{M1}$), quadrupole ($G_{E2}$) octupole ($G_{M3}$), are estimated within covariant spectator quark model, terms square momentum transfer $q^2$. free parameters wave function, including a $S$-wave state two independent $D$-wave states radial functions admixture coefficients fixed by comparison with lattice QCD data ($Q^2=-q^2 \le 0$) recent $e^+ e^- \to \Omega^- \bar \Omega^+$ from CLEO ($q^2 > 0$). estimates for $q^2 \ge 4 M_\Omega^2$ based on large-$q^2$ asymptotic relations ($M_\Omega$ is mass). examine also impact large-$Q^2$ correlations between different analyze possible solutions. moments $\Omega^-$, integrated cross sections very large $q^2$ model results.