Timelike gamma* N -> Delta form factors and Delta Dalitz decay

Abstract

We extend a covariant model, tested before in the spacelike region for the physical and lattice QCD regimes, to a calculation of the gamma* N -> Delta reaction in the timelike region, where the square of the transfered momentum, q^2, is positive (q^2>0). We estimate the Dalitz decay Delta -> Ne+e- and the Delta distribution mass distribution function. The results presented here can be used to simulate the NN -> NNe+e- reactions at moderate beam kinetic energies.

14 pages, 11 figures

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• Using the Single Quark Transition Model to predict nucleon resonance amplitudes
• ${\gamma }^{\ast }N\to N(1710)$ transition at high momentum transfer
• Dilepton production at SIS energies with the GiBUU transport model