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VOLUME 76 | ISSUE 4 | PAGE 231
Saturation of nuclear partons: the fermi statistics or nuclear opacity?
N. N. Nikolaev+*, W. Schäfer^\square, B. G. Zakharov*, V. R. Zoller^\triangle
+Institute f. Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
*L. D. Landau Institute for Theoretical Physics RAS, 142432 Chernogolovka, Russia
^\squareNORDITA, DK-2100 Copenhagen O, Denmark
^\triangleInstitute for Theoretical and Experimental Physics, 117218 Moscow, Russia


PACS: 24.85.+p
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 p measures precisely the momentum distribution of quarks in the beam photon, the rôle 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 Weizsäcker-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.


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