Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity?

Details Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity? Saturation of Nuclear Partons: the Fermi Statistics or Nuclear Opacity?

2002-07-17

arxiv.org/abs/hep-ph/0207210v2

JETP Lett. 76 (2002) 195-200; Pisma Zh.Eksp.Teor.Fiz. 76 (2002) 231-235

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pp., 1 eps fig, typos in eqs. (7),(8) corrected

Scientific paper

10.1134/1.1517383

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.

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