Electroproduction of the Delta Resonance at High Momentum Transfer

V. V. Frolov et al

doi:10.1103/PhysRevLett.82.45

paper

Electroproduction of the Delta Resonance at High Momentum Transfer

arXiv:hep-ex/9808024 · doi:10.1103/PhysRevLett.82.45

Abstract

We studied the electroproduction of the Delta(1232) resonance via the reaction p(e,e'p)\pi0 at four-momentum transfers Qsq = 2.8 and 4.0 GeV^2. This is the highest Qsq for which exclusive resonance electroproduction has ever been observed. Decay angular distributions for Delta to p-pi0 $w er e m e a s u r e d o v er a w i d er an g eo f ba r y ce n t r i ce n er g i esco v er in g t h er eso nan ce . T h e$ N-Δ$ transition form factor G*_M and ratios of resonant multipoles E{1+}/M{1+} and S{1+}/M{1+} were extracted from the decay angular distributions. These ratios remain small, indicating that perturbative QCD is not applicable for this reaction at these momentum transfers.

5 pages, 3 figures