Collinear Factorization Violation and Reggeization
arXiv:2607.14259
The paper derives an all‑order factorization for soft‑collinear subgraphs in space‑like collinear limits involving Glauber gluon exchanges, showing how these contributions exhibit Reggeization and simplifying the calculation of factorization‑breaking terms in multi‑point amplitudes.
Abstract
We derive an all-order soft-collinear subgraph factorization in the space-like collinear limits of amplitudes for single gluon pinched in the Glauber region. We show that these contributions exhibit Reggeization, combining aspects of both forward and hard scattering. By deforming away from the Glauber region wherever possible we demonstrate a dramatic simplification of the effective theory subgraphs and thereby drastically reducing the complexity in computing collinear factorization breaking terms in multi-point amplitudes. Our work is aided with development of new software tools initiating a systematic study of processes involving Glauber exchanges at a multi-loop level.
6 pages + 2 pages end matter, 4 figures