The resummation approach to evolution equations

Details The resummation approach to evolution equations The resummation approach to evolution equations

1997-03-15

arxiv.org/abs/hep-ph/9703328v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages in Latex

Scientific paper

We derive the evolution equations of parton distribution functions appropriate in different kinematic regions in a unified and simple way using the resummation technique. They include the Gribov-Lipatov-Altarelli-Parisi equation for large momentum transfer $Q$, the Balitskii-Fadin-Kuraev-Lipatov equation for a small Bjorken variable $x$, and the Ciafaloni-Catani-Fiorani-Marchesini equation which unifies the above two equations. We propose a modified Balitskii-Fadin-Kuraev-Lipatov equation from the view point of the resummation. This modified version possesses an intrinsic $Q$ dependence and its predictions for the structure function $F_2(x,Q^2)$ are consistent with the HERA data.

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