Resummation of small x contributions to hard-scattering amplitudes
R. Kirschner, M. Segond
TL;DR
This paper revisits the resummation of small x corrections in QCD hard-scattering amplitudes, correcting previous expressions and demonstrating the impact on structure functions and electroproduction processes.
Contribution
It provides a corrected expression for the K-factor in small x resummation within collinear factorisation, improving upon earlier work by Catani and Hautmann.
Findings
Corrected the expression for the K-factor in small x resummation.
Demonstrated the significance of the correction in structure function F_L.
Showed impact on exclusive electroproduction calculations.
Abstract
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 log x approximation. The corresponding expression by Catani and Hautmann (1994) has to be corrected. The significance of the correction is demonstrated in the examples of structure function F_L and of exclusive electroproduction.
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