Effect of gluon-exchange pair-currents on the ratio G(E(P))/G(M(P))

Abstract

The effect of one-gluon-exchange (OGE) pair-currents on the ratio ${\mu }_p{G}_E^p/G_M^p$ for the proton is investigated within a nonrelativistic constituent quark model (CQM) starting from $SU(6)\times O(3)$ nucleon wave functions, but with relativistic corrections. We found that the OGE pair-currents are important to reproduce well the ratio ${\mu }_p{G}_E^p/G_M^p$. With the assumption that the OGE pair-currents are the driving mechanism for the violation of the scaling law we give a prediction for the ratio ${\mu }_n{G}_E^n/G_M^n$ of the neutron.

arXiv comment5 pages, 4 figures

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• The electric form factor of the neutron and its chiral content
• Magnetization screening from gluonic currents and scaling law violation in the ratio of magnetic form factors for neutron and proton
• Ratio of the proton electromagnetic form factors from meson dressing