NLO BFKL in gamma* gamma* collisions

TL;DR

This paper applies the NLO BFKL approach to calculate the total hadronic cross section in virtual photon collisions, incorporating subleading corrections and comparing with previous models.

Contribution

It introduces a next-to-leading order BFKL calculation for gamma* gamma* collisions with improved impact factors including subleading terms for better accuracy.

Findings

NLO BFKL provides refined cross section estimates.

Inclusion of subleading impact factor terms improves theoretical predictions.

Comparison shows differences with previous leading-order approximations.

Abstract

We study in the BFKL approach the total hadronic cross section for the collision of two virtual photons for energies in the range of LEP2 and of future linear colliders. The BFKL resummation is done at the next-to-leading order in the BFKL Green's function; photon impact factors are taken instead at the leading order, but with the inclusion of the subleading terms required by invariance under changes of the renormalization scale and of the BFKL scale $s_0$. We compare our results with previous estimations based on a similar kind of approximation.