High $Q^2$ Probe of Nuclear Spectral Function and Color Transparency

Details High $Q^2$ Probe of Nuclear Spectral Function and Color Transparency High $Q^2$ Probe of Nuclear Spectral Function and Color Transparency

1993-11-11

arxiv.org/abs/hep-ph/9311275v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, two figs. available upon request. Invited talk at the Workshop on electron-nucleus scattering, Marciana Marina, Elba,

Scientific paper

Contrary to widespread opinion, color transparency (CT) brings essential ambiguity to, rather than helps in, study of the nuclear spectral function in quasielastic lepton scattering, $A(l,l'p)A'$, at high $Q^2$. Although the nuclear attenuation vanishes, the final state interaction (FSI) of a small-size ejectile wave packet, propagating through nuclear matter, remains. It manifests itself in a substantial, but uncertain, longitudinal momentum transfer to the nuclear medium. We predict a strong Fermi-momentum bias of the nuclear transparency at high $Q^2$, which enters as a factor at the nuclear spectral function, and makes uncertain the results of measuring the high-momentum tail of Fermi distribution.

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