2005/09/06 by Vladimir Pascalutsa, Carl E. Carlson, Marc Vanderhaeghen · 1 citation
Physics and Astronomy · #Amplitude #Atomic physics #Dipole #High-Energy Particle Collisions Research #Momentum (technical analysis) #Momentum transfer #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Quadrupole #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #hep-ph
paper · pdf · doi:10.1103/physrevlett.96.012301
published as Phys.Rev.Lett.96:012301,2006 · 4 pages, 4 figures
arxiv created 2005/09/06 · openalex publication_date 2006/01/06 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We examine the two-photon exchange contribution to the eN\ensuremath→e\ensuremathΔ(1232)\ensuremath→e\ensuremathπN process with the aim of a precision study of the ratios of electric quadrupole (E2) and Coulomb quadrupole (C2) to the magnetic dipole (M1) \ensuremathγ*N\ensuremathΔ transitions. We relate the two-photon exchange amplitude to the N\ensuremath→\ensuremathΔ generalized parton distributions and obtain a quantitative estimate of the two-photon effects. The two-photon exchange corrections to the C2/M1 ratio depend strongly on whether this quantity is obtained from an interference cross section or from the Rosenbluth-type cross sections, in similarity with the elastic, eN\ensuremath→eN, process.