One-loop Lipatov vertex in QCD with higher ϵ -accuracy

bstract The effective Reggeon-Reggeon-gluon vertex, known as Lipatov vertex, is the key ingredient that allows to develop the BFKL approach in QCD. Within the next-to-leading logarithmic approximation, it is sufficient to know its one-loop corrections, in dimensional regularization ( D = 4 + 2 ϵ ), up to the constant term in the ϵ -expansion. In the next-to-next-to-leading approximation, however, the one-loop Lipatov vertex is needed up to the order ϵ 2 . In this paper we present the expression for this vertex in dimensional regularization up to the required accuracy.