Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-08-19
Phys.Rev.C79:015207,2009
Physics
Nuclear Physics
Nuclear Theory
8 pages, 7 figures, 1 table, final version, as published in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.79.015207
We investigate the early onset of pionic color transparency ($\pi$CT) observed at Jefferson Laboratory (JLAB) in semi--exclusive pion electroproduction reaction $A(e,e'\pi^+)$ off nuclei. In the present description the primary $\gamma^*p \to \pi^+ n$ 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.
Gallmeister Kai
Kaskulov Murat M.
Mosel Ulrich
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