title: Geometric scaling for the total gamma(*)p cross section in the low x region.
abstract: We observe that the saturation model of deep inelastic scattering predicts a geometric scaling of the total gamma(*)p cross section in the region of small Bjorken variable x. The geometric scaling in this case means that the cross section is a function of only one dimensionless variable tau = Q(2)R(2)(0)(x), where the function R(0)(x) decreases with decreasing x. We show that the experimental data from HERA in the region x<0.01 confirm the expectations of this scaling over a very broad region of Q(2). We suggest that the geometric scaling is more general than the saturation model.
authors.affiliation: INFN, Sezione di Firenze, Italy.
authors.forename: A M
authors.initials: AM
authors.lastname: Staśto
authors.forename: K
authors.initials: K
authors.lastname: Golec-Biernat
authors.forename: J
authors.initials: J
authors.lastname: Kwieciński