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 nextto- leading logarithmic approximation, it is sufficient to know its one-loop corrections, in dimensional regularization (D = 4 + 2 ), up to the constant term in the -expansion. In the next-to-next-to-leading approximation, however, the one-loop Lipatov vertex is needed up to the order 2. In this paper we present the expression for this vertex in dimensional regularization up to the required accuracy.
One-loop Lipatov vertex in QCD with higher ϵ-accuracy
Fucilla, Michael
Membro del Collaboration Group
;Papa, AlessandroMembro del Collaboration Group
2023-01-01
Abstract
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 nextto- leading logarithmic approximation, it is sufficient to know its one-loop corrections, in dimensional regularization (D = 4 + 2 ), up to the constant term in the -expansion. In the next-to-next-to-leading approximation, however, the one-loop Lipatov vertex is needed up to the order 2. In this paper we present the expression for this vertex in dimensional regularization up to the required accuracy.File in questo prodotto:
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