Regular Article - Theoretical Physics
Small x resummation in collinear factorisation
Institut für Theoretische Physik, Universität Leipzig, PF 100 920, 04009, Leipzig, Germany
* e-mail: Roland.Kirschner@itp.uni-leipzig.de
Revised: 15 April 2010
Published online: 22 June 2010
The summation of the small x-corrections to hard-scattering QCD amplitudes by collinear factorisation method is reconsidered and the K-factor is derived in leading ln x approximation with a result differing from the corresponding expression by Catani and Hautmann (Nucl. Phys. B 427, 475, 1994). The significance of the difference is demonstrated in the examples of structure function F L and of exclusive vector meson electroproduction. The formulation covers the channels of non-vanishing conformal spin n paving the way for new applications.
© Springer-Verlag / Società Italiana di Fisica, 2010