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

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Cited by in corpus (22)

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• Neutrino Interactions with Nucleons and Nuclei: Importance for Long-Baseline Experiments
• Pion production in the MiniBooNE experiment
• Color Transparency: past, present and future
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