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arXiv · 0707.1481

Measurement of Nuclear Transparency for the A(e,e' pi^+) Reaction

B. Clasie
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Abstract

We have measured the nuclear transparency of the A(e,e' pi^+) process in ^{2}H,^{12}C, ^{27}Al, ^{63}Cu and ^{197}Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q^2 = 1.1 - 4.7 (GeV/c)^2. The nuclear transparency was extracted as the super-ratio of $(σ_A/σ_H)$ from data to a model of pion-electroproduction from nuclei without pi-N final state interactions. The Q^2 and atomic number dependence of the nuclear transparency both show deviations from traditional nuclear physics expectations, and are consistent with calculations that include the quantum chromodynamical phenomenon of color transparency.

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B. Clasie. 2007-12-17. Measurement of Nuclear Transparency for the A(e,e' pi^+) Reaction. https://doi.org/10.1103/physrevlett.99.242502

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