Electroproduction of the Roper resonance and the constituent quark model

Details Electroproduction of the Roper resonance and the constituent quark model Electroproduction of the Roper resonance and the constituent quark model

1996-09-21

arxiv.org/abs/nucl-th/9609047v2

Phys.Lett. B397 (1997) 13-19

Physics

Nuclear Physics

Nuclear Theory

revised version to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)00149-4

A parameter-free evaluation of the $N - P_{11}(1440)$ electromagnetic transition form factors is performed within a light-front constituent quark model, using for the first time the eigenfunctions of a mass operator which generates a large amount of configuration mixing in baryon wave functions. A one-body electromagnetic current, which includes the phenomenological constituent quark form factors already determined from an analysis of pion and nucleon experimental data, is adopted. For $Q^2$ up to few $(GeV/c)^2$, at variance with the enhancement found in the elastic channel, the effect of configuration mixing results in a significant suppression of the calculated helicity amplitudes with respect to both relativistic and non-relativistic calculations, based on a simple gaussian-like ansatz for the baryon wave functions.

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