Eur. Phys. J. C 20, 517-522 (2001)
DOI: 10.1007/s100520100685

Parton densities and dipole cross-sections at small x in large nuclei

N. Armesto¹ and M.A. Braun<sup>2

1</sup>  Departamento de Física, Módulo C2, Planta baja, Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain
²  Department of High-Energy Physics, St. Petersburg University, 198504 St. Petersburg, Russia

(Received: 4 April 2001 / Revised version: 24 April 2001 / Published online: 8 June 2001 -© Springer-Verlag / Società Italiana di Fisica 2001)

Abstract
Unintegrated gluon densities in nuclei, dipole-nucleus cross-sec tions and quark densities are numerically investigated in the high-color limit, with the scattering on a heavy nucleus exactly described by the sum of fan diagrams of BFKL pomerons. The initial condition for the evolution in rapidity is quickly forgotten, and the gluon density presents a "supersaturation" pattern, as previous studies indicated. Both dipole-nucleus cross-sec tions and quark densities present the expected saturation features. Identifying the position in transverse momentum l of the maximum of the gluon distribution with the saturation momentum Q_s(y,b), at large rapidities all distributions depend on only one variable, l/Q_s(y,b) or rQ_s(y,b).

© Società Italiana di Fisica, Springer-Verlag 2001