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

TL;DR

This paper extends a covariant model to analyze the gamma* N -> Delta reaction in the timelike region, estimating Dalitz decay and mass distribution functions, useful for simulating related nuclear reactions at moderate energies.

Contribution

It introduces a novel extension of a covariant model to the timelike region for gamma* N -> Delta reactions, including decay estimations and distribution functions.

Findings

Estimated Dalitz decay Delta -> Ne+e-

Calculated Delta mass distribution function

Model applicable for moderate energy nuclear reaction simulations

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.