Pionic transparency in semi-exclusive electroproduction off nuclei

Abstract

We investigate the early onset of pionic color transparency ($\pi$CT) observed at Jefferson Laboratory (JLAB) in semi--exclusive pion electroproduction reaction $A(e,e^{\prime }{\pi }^{+})$ off nuclei. In the present description the primary ${\gamma }^{\ast }p\to {\pi }^{+}n$ interaction is described very well both for the longitudinal and the transverse polarizations. For the final state interactions a coupled--channel treatment of the interactions of transmitted hadrons allows to go beyond the Glauber approximation. We show that a proper distinction between the soft hadronic and hard partonic components of the electroproduction amplitude is essential for a quantitative description of the measured nuclear transparency. The data are well reproduced if one assumes that point--like configurations are produced in the regime of hard deep--inelastic scattering (DIS) off partons and dominate the transverse channel.

8 pages, 7 figures, 1 table, final version, as published in Phys. Rev. C

References in corpus (7)

• Measurement of Nuclear Transparency for the A(e,e' pi^+) Reaction
• Time Dependent Hadronization via HERMES and EMC Data Consistency
• Photoproduction of eta-mesons off nuclei for Eg < 2.2 GeV
• Color transparency and short-range correlations in exclusive pion photo- and electroproduction from nuclei
• The influence of the nuclear medium on inclusive electron and neutrino scattering off nuclei
• Deeply inelastic pions in the exclusive reaction $p(e,e^{\prime }{\pi }^{+})n$ above the resonance region
• Surface and volume effects in the photoabsorption of nuclei

Cited by in corpus (1)

• Deep exclusive electroproduction of ${\pi }^{+}$ at HERMES