Gluon distributions from Oliveira-Martin-Ryskin combined BFKL+DGLAP evolution equations
Abstract
Kwiecinski, Martin, Stasto [13] argue for inclusion of DGLAP terms into BFKL evolution of unintegrated gluon density. The equation was reformulated by Oliveira, Martin, Ryskin [6] employing the opening angle θ = k/xp as the evolution variable. It leads to a description of a θ-integrated gluon density. This paper is a numerical study of these two similar combined BFKL+DGLAP formulations. It is a demonstration of feasibility of the new approach. The different ways of subtracting the contribution common for BFKL and DGLAP proposed in [13] and [6] are compared. The numerical tests confirm that the θ variable is a more natural evolution variable for this kind of equation.
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