Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity?
Abstract
We derive the two-plateau momentum distribution of final state (FS) quarks produced in deep inelastic scattering (DIS) off nuclei in the saturation regime. The diffractive plateau which dominates for small transverse momentum p measures precisely the momentum distribution of quarks in the beam photon, the role of the nucleus is simply to provide an opacity. The plateau for truly inelastic DIS exhibits a substantial nuclear broadening of the FS momentum distribution. We discuss the relationship between the FS quark densities and the properly defined initial state (IS) nuclear quark densities.The Weizs\"acker-Williams glue of a nucleus exhibits a substantial nuclear dilution, still soft IS nuclear sea saturates because of the anti-collinear splitting of gluons into sea quarks.Keywords
All Related Versions
- Version 1, 2002-07-17, ArXiv
- Version 2, 2002-07-23, ArXiv
- Published version: JETP Letters, 76 (4), 195.
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