Electromagnetic final state interactions in high energy nuclear collisions: Isobaric comparisons

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Abstract
Electromagnetic final state interactions modifying the final energies and momenta of the products of high-energy nuclear collisions are addressed with the help of two different models. Assumptions and approximations of the two calculations are described. Results of the models are compared to experimental neutron and proton angular distributions, to cross section ratios of products with different charges but the same baryon number, and to each other. The simple model is used to account for the different behavior of the neutron and proton angular distributions when inclusive and multiplicity selected data are compared. The more elaborate prescription gives the electromagnetic effects on the energies and momenta of the individual charged particles and is applied to augment an event generator.