Reassessing the Connection Between the Color Glass Condensate and TMD PDFs
Abstract
Paying particular attention to the different types of gluons, collinear, soft and Glauber, we argue that, in its standard formulation, the CGC does not contain the collinear sector required for a meaningful comparison with TMD factorization. The CGC Wilson lines usually identified as part of the proton matrix element should instead be interpreted as the equivalent of a soft factor. Restoring the missing collinear exchanges, we obtain a new definition of small-x PDFs from an explicit calculation of the DIS cross section using CGC Feynman rules. The resulting expression can be cast in a form resembling TMD factorization without being equivalent to it. Finally, we discuss the evolution of these small-x PDFs with respect to the rapidity cutoff Λ and the Bjorken variable xb.
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BibTeX
@misc{guiot2026reassessing,
title = {{Reassessing the Connection Between the Color Glass Condensate and TMD PDFs}},
author = {Benjamin Guiot},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.10189},
eprint = {2610.10189},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.10189},
}
RIS
TY - UNPB
TI - Reassessing the Connection Between the Color Glass Condensate and TMD PDFs
AU - Benjamin Guiot
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.10189
UR - https://arxiv.org/abs/2610.10189
AB - Paying particular attention to the different types of gluons, collinear, soft and Glauber, we argue that, in its standard formulation, the CGC does not contain the collinear sector required for a meaningful comparison with TMD factorization. The CGC Wilson lines usually identified as part of the proton matrix element should instead be interpreted as the equivalent of a soft factor. Restoring the missing collinear exchanges, we obtain a new definition of small-x PDFs from an explicit calculation of the DIS cross section using CGC Feynman rules. The resulting expression can be cast in a form resembling TMD factorization without being equivalent to it. Finally, we discuss the evolution of these small-x PDFs with respect to the rapidity cutoff Λ and the Bjorken variable x_b.
ER -