QED corrections to the evolution of parton distributions

Details QED corrections to the evolution of parton distributions QED corrections to the evolution of parton distributions

2004-03-18

arxiv.org/abs/hep-ph/0403200v1

Phys.Lett. B590 (2004) 190-198

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages

Scientific paper

10.1016/j.physletb.2004.04.009

We study the systematic inclusion of QED corrections in the evolution of parton distributions. O(alpha) corrections modify the evolution equation for parton distributions. They introduce additional parton distributions, like the photon distribution in the nucleon, and lead to additional mixing effects. We discuss the modifications for a realistic model of N_f,up up-type flavours and N_f,down down-type flavours. We have implemented these corrections into a numerical program and we quantify the size of these effects in a toy model. The corrections reach the order of 1%.

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