Intrinsic $k_T$ and soft gluons in Monte Carlo event generators

Louis Moureaux; Aleksandra Lelek; Francesco Hautmann; Laurent Favart

Intrinsic $k_T$ and soft gluons in Monte Carlo event generators

High Energy Physics - Phenomenology 2025-12-01 v1

Authors: Louis Moureaux , Aleksandra Lelek , Francesco Hautmann , Laurent Favart

Abstract

Experimental measurements of the transverse momentum of Drell-Yan lepton pairs are sensitive to non-perturbative physics associated with the intrinsic parton transverse momentum $k_T$ . We discuss recent determinations of intrinsic $k_T$ in the context of transverse momentum dependent (TMD) parton branching calculations and collinear parton-shower Monte Carlo generators. We illustrate the influence of the soft-gluon resolution scale and the non-perturbative Sudakov region on the intrinsic $k_T$ extraction. We emphasize the relevance of the correct treatment of correlated uncertainties between different transverse momentum bins in TMD fits and present an application to the determination of the intrinsic $k_T$ in the forward rapidity region.

Keywords

Monte Carlo event generator intrinsic $k_T$ soft gluons TMD Sudakov Drell-Yan

Cite

@article{arxiv.2511.23291,
  title  = {Intrinsic $k_T$ and soft gluons in Monte Carlo event generators},
  author = {Louis Moureaux and Aleksandra Lelek and Francesco Hautmann and Laurent Favart},
  journal= {arXiv preprint arXiv:2511.23291},
  year   = {2025}
}

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Intrinsic $k_T$ and soft gluons in Monte Carlo event generators

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