The ratio of the beauty structure functions Rb=FLbF2b at low x

We study the structure functions Fkb(x,Q2) (k=2,Lk=2,L) and the reduced cross section σrb(x,Q2) for small values of Bjorken's x   variable with respect to the hard (Lipatov) pomeron for the gluon distribution and provide a compact formula for the ratio RbRb that is useful to extract the beauty structure function from the beauty reduced cross section, in particular at DESY HERA. Also we show that the effects of the nonlinear corrections to the gluon distribution tame the behavior of the beauty structure function and the beauty reduced cross section at low x.