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The $\Delta(1232) \to \gamma^\ast N$ magnetic dipole form factor ($G_M^\ast$)is described here within a new covariant model that combines the valence quarkcore together with the pion cloud contributions. The pion cloud term isparameterized by two terms: one connected to the pion electromagnetic formfactor, the other to the photon interaction with intermediate baryon states.The model can be used in studies of pp and heavy ion collisions. In thetimelike region this new model improves the results obtained with a constantform factor model fixed at its value at zero momentum transfer. At the sametime, and in contrast to the Iachello model, this new model predicts a peak forthe transition form factor at the expected position, i.e. at the $\rho$ masspole. We calculate the decay of the $\Delta \to \gamma N$ transition, theDalitz decay ($\Delta \to e^+ e^- N$), and the $\Delta$ mass distributionfunction. The impact of the model on dilepton spectra in pp collisions is alsodiscussed.

R\^ole of the pion electromagnetic form factor in the $\Delta(1232) \to \gamma^\ast N$ timelike transition