Properties of the gluon recombination functions
arXiv:hep-ph/0406213
Abstract
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.
18 pages, 6 figures. Corrections to Tables 1 and 2. Conclusions unchanged
Cited by in corpus (5)
- An Analysis of Parton Distribution Functions of the Pion and the Kaon with the Maximum Entropy Input
- Pion Valence Quark Distributions from Maximum Entropy Method
- Antishadowing effects in the unitarized BFKL equation
- Applications of a nonlinear evolution equation II: the EMC effect
- A determination of the flavor asymmetric sea quarks in the proton