Deeply inelastic pions in the exclusive reaction $p(e,e^{\prime }{\pi }^{+})n$ above the resonance region

Abstract

A model for the $p(e,e^{\prime }{\pi }^{+})n$ 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 $Q^2$ 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 $Q^2$ 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.

6 pages, 4 figures. published version

References in corpus (5)

• PYTHIA 6.4 Physics and Manual
• Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
• Measurement of Nuclear Transparency for the A(e,e' pi^+) Reaction
• Longitudinal-Transverse Separations of Structure Functions at Low $Q^2$ for Hydrogen and Deuterium
• Role of the rho meson in the description of pion electroproduction experiments at JLab

Cited by in corpus (7)

• Measurement of Exclusive ${\pi }^0$ Electroproduction Structure Functions and their Relationship to Transversity GPDs
• Pionic transparency in semi-exclusive electroproduction off nuclei
• Deep exclusive ${\pi }^{+}$ electroproduction off the proton at CLAS
• Color transparency in hadronic attenuation of rho0 mesons
• Deep exclusive electroproduction of ${\pi }^{+}$ at HERMES
• Strangeness Suppression in q-qbar Creation Observed in Exclusive Reactions
• An Improved Hadronic Model for Pion Electroproduction