The electromagnetic form factors of the $\Delta$ baryon are evaluated within the framework of a covariant spectator quark model, where S- and D-states are included in the $\Delta$ wave function. We predict all the four $\Delta$ multipole form factors: the electric charge $G_{E0}$, the magnetic dipole $G_{M1}$, the electric quadrupole $G_{E2}$ and the magnetic octupole $G_{M3}$. We compare our predictions with other theoretical calculations. Our results are compatible with the available experimental data and recent lattice QCD data.

• Received 24 February 2010

DOI:https://doi.org/10.1103/PhysRevD.81.113011