ElectromagneticN-Δtransition at highQ2

Abstract

The electromagnetic N-Δ transition is studied using perturbative QCD. Several results are obtained. Among them is that at high $Q^2$, in contrast to low $Q^2$, the E2 multipole amplitude is larger than the M1; their ratio is √3 . Also, the asymptotic $Q^2$ dependence of N-Δ form factors should be the same as their elastic e-N scattering counterparts, when such counterparts exist. Data for some N-Δ form factors show that they fall faster with $Q^2$ than the nucleon dipole form, but since we have an underlying theory we can now discover that this is due to kinematic factors in the definition of the form factors in question.