Paper
Interplay of the CGC and TMD frameworks to all orders in kinematic twist
Authors
Tolga Altinoluk, Renaud Boussarie, Piotr Kotko
Abstract
A framework for an improved TMD (iTMD) factorization scheme at small , involving off-shell perturbative subamplitudes, was recently developed as an interpolation between the TMD regime and the BFKL regime. In this article, we study the relation between CGC and iTMD amplitudes. We first show how the dipole-size expansion of CGC amplitudes resembles the twist expansion of a TMD amplitude. Then, by isolating kinematic twists, we prove that iTMD amplitudes are obtained with infinite kinematic twist accuracy by simply getting rid of all genuine twist contributions in a CGC amplitude. Finally we compare the amplitudes obtained via a proper kinematic twist expansion to those obtained via a more standard dilute expansion to show the relation between the iTMD framework and the dilute low framework.