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arXiv · hep-ph/9503294

Properties of the Scale Invariant $O(g^4)$ Lipatov Kernel

Claudio Coriano'·Alan R. White
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Abstract

We study the scale-invariant $O(g^4)$ kernel which appears as an infra-red contribution in the BFKL evolution equation and is constructed via multiparticle $t$-channel unitarity. We detail the variety of Ward identity constraints and infra-red cancellations that characterize its infrared behaviour. We give an analytic form for the full non-forward kernel. For the forward kernel controlling parton evolution at small-x, we give an impact parameter representation, derive the eigenvalue spectrum, and demonstrate a holomorphic factorisation property related to conformal invariance. The results show that, at next-to-leading-order, the transverse momentum infra-red region may produce a strong reduction of the BFKL small-x behavior.

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BibTeXRIS

Claudio Coriano', Alan R. White. 1995-03-12. Properties of the Scale Invariant $O(g^4)$ Lipatov Kernel. https://doi.org/10.1016/0550-3213(95)00353-t

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