Collinear improvement of the BFKL kernel in the electroproduction of two light vector mesons

TL;DR

This paper evaluates a renormalization group-improved BFKL kernel for electroproduction of light vector mesons, demonstrating improved energy dependence and scale setting at NLA compared to unimproved kernels.

Contribution

It introduces a collinear improvement to the BFKL kernel that enhances the description of the electroproduction process at next-to-leading order.

Findings

Achieves smoother energy dependence of the amplitude.

Sets renormalization and energy scales closer to kinematic scales.

Demonstrates improved stability of the BFKL approach.

Abstract

We test the performance of a RG-improved kernel in the determination of the amplitude of a physical process, the electroproduction of two light vector mesons,in the BFKL approach at the next-to-leading approximation (NLA). We find that a smooth behavior of the amplitude with the center-of-mass energy can be achieved, setting the renormalization and energy scales appearing in the subleading terms to values much closer to the kinematical scales of the process than in approaches based on unimproved kernels.