# EPS-HEP2019

10-17 July 2019
Ghent
Europe/Brussels timezone

## Relating CGC and TMD factorization frameworks beyond leading twist

11 Jul 2019, 10:34
18m
ICC - Baeckeland 1 (Ghent)

### ICC - Baeckeland 1

#### Ghent

Parallel talk Heavy Ion Physics

### Speaker

Piotr Kotko (Penn State University)

### Description

It is known already for some time that the leading power limit of the Color Glass Condensate (CGC) expressions for dijet production can be identified with the (generalized) Transverse Momentum Dependent (TMD) factorization in the small x regime. In the latter formalism, there are several TMD gluon distributions containing distinct Wilson line operators, and corresponding on-shell hard factors. There is a natural extension of this formalism, which generalizes the on-shell hard factors to the off-shell case in a gauge invariant way -- the so-called small-x improved TMD factorization (ITMD) [JHEP 1509 (2015) 106], which allows to study the kinematic regime beyond back-to-back configuration, and thus beyond the leading twist. In a recent work [arXiv:1901.01175] we studied the relation of the ITMD approach and the CGC theory in detail. We have shown that the ITMD framework corresponds to isolated and resummed all kinematic twists in the CGC theory.

### Primary author

Piotr Kotko (Penn State University)