1205.2575 (G. Ramalho et al.)

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

G. Ramalho, M. T. Pena

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.

View original: http://arxiv.org/abs/1205.2575