1305.6406 (E. G. de Oliveira et al.)

Treatment of the infrared contribution: NLO QED evolution as a pedagogic
example    [PDF]

E. G. de Oliveira, A. D. Martin, M. G. Ryskin

We show that the conventional prescription used for DGLAP parton evolution at NLO has an inconsistent treatment of the contribution from the infrared (IR) region. We illustrate the problem by studying the simple example of QED evolution, treating the electron and photon as partons. The deficiency is not present in a physical approach which removes the IR divergency and allows calculation in the normal 4-dimensional space.

View original: http://arxiv.org/abs/1305.6406