BFKL resummation effects in the gamma* gamma* total hadronic cross section

TL;DR

This paper investigates the total hadronic cross section for virtual photon collisions using the BFKL approach at next-to-leading order, providing refined theoretical predictions relevant for LEP2 and future colliders.

Contribution

It introduces a next-to-leading order BFKL calculation with improved impact factors, enhancing the accuracy of theoretical predictions for gamma* gamma* collisions.

Findings

Refined BFKL predictions at NLO for gamma* gamma* cross sections.

Comparison shows differences with previous leading-order estimates.

Results are relevant for experimental analyses at LEP2 and future colliders.

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 in the range 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 estimates based on a similar kind of approximation.