Studying QCD factorizations in exclusive gamma* gamma* -> rho^0_L rho^0_L

TL;DR

This paper investigates the QCD factorization properties in the exclusive process e+ e- -> e+ e- rho^0_L rho^0_L, demonstrating collinear factorization at moderate energies and exploring BFKL effects at high energies relevant for future colliders.

Contribution

It provides a detailed analysis of QCD factorization in this process, highlighting the emergence of GDA and TDA at moderate energies and the potential to probe BFKL resummation at high energies.

Findings

Collinear QCD factorization is demonstrated at moderate energies.

Generalized distribution amplitudes and transition distribution amplitudes are involved.

The process offers a promising probe of BFKL effects at high energies.

Abstract

The exclusive process e+ e- -> e+ e- rho^0_L rho^0_L allows to study various dynamics and factorization properties of perturbative QCD. At moderate energy, we demonstrate how collinear QCD factorization emerges, involving generalized distribution amplitudes (GDA) and transition distribution amplitudes (TDA). At higher energies, in the Regge limit of QCD, we show that it offers a promising probe of the BFKL resummation effects to be studied at the International Linear Collider (ILC).