Geometric scaling for the total gamma(*)p cross section in the low x region.
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.
Staśto
A M
AM
INFN, Sezione di Firenze, Italy.
Golec-Biernat
K
K
Kwieciński
J
J