2008/04/30 by M. Kaskulov, Murat M. Kaskulov, K. Gallmeister +3 · 4 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.78.114022
published as Phys.Rev.D78:114022,2008 · 6 pages, 4 figures. published version
openalex publication_date 2008/12/18 · arxiv created 2009/01/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A model for the p(e,e^\ensuremath'\ensuremathπ+)n reaction which combines an improved treatment of gauge invariant meson-exchange currents and hard deep-inelastic scattering (DIS) of virtual photons off nucleons is proposed. It is shown that DIS dominates and explains the transverse response at moderate and high photon virtualities Q2, whereas the longitudinal response is dominated by hadronic degrees of freedom and the pion electromagnetic form factor. This leads to a combined description of the longitudinal and transverse components of the cross section in a wide range of photon virtuality Q2 and momentum transfer to the target t and solves the longstanding problem of the observed large transverse cross sections. The latter are shown to be sensitive to the intrinsic transverse momentum distribution of partons.