BFKL pomeron in the external field of the nucleus in (2+1)-dimensional QCD

TL;DR

This paper investigates how the BFKL pomeron propagator behaves in an external nuclear field within (2+1)-dimensional QCD, revealing that the field's behavior at large rapidities significantly affects the propagator's decay rate.

Contribution

It provides new insights into the impact of external nuclear fields on the BFKL pomeron in (2+1)D QCD, especially regarding the field's asymptotic behavior.

Findings

Propagator vanishes faster when the field remains non-zero at large rapidities.

No change in propagator behavior if the nuclear field vanishes at high rapidities.

Abstract

The behaviour of the pomeron propagator in the external nuclear field is studied in the (2+1)-dimensional QCD. It is shown that in the physically interesting case when the field does not vanish at large rapidities the propagator in the field vanishes much faster than in the vacuum, in agreement with the results found in the local Regge-Gribov model. However if the nuclear field vanishes at high rapidities the field does not change the behaviour of the pomeron propagator.