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arXiv · 2511.23291

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

Louis Moureaux·Aleksandra Lelek·Francesco Hautmann·Laurent Favart
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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.

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Louis Moureaux, Aleksandra Lelek, Francesco Hautmann, Laurent Favart. 2025-11-28. Intrinsic $k_T$ and soft gluons in Monte Carlo event generators. https://arxiv.org/abs/2511.23291

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