Properties of the gluon recombination functions

Details Properties of the gluon recombination functions Properties of the gluon recombination functions

2004-06-21

arxiv.org/abs/hep-ph/0406213v2

HEP. & NP. Vol.29,No.2(2005),109-114

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 6 figures,replaced by the version published in HEP. & NP

Scientific paper

The gluon recombination functions in the twist-4 QCD evolution equations are studied at the leading logarithmic approximation using both the covariant and non-covariant methods. We justify that the infrared singularities in the twist-4 coefficient functions impede us to simply separate the QCD evolution kernels from the coefficient functions at the equivalent particle approximation. In particulary, we point out that the gluon recombination functions in the GLR-MQ evolution equation are unavailable. The methods avoiding the IR divergences are discussed, which can be used in the derivations of the evolution kernels and coefficient functions at the higher twist level.

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