Center-of-mass energy dependence of intrinsic-$k_{\textrm{T}}$ distributions obtained from Drell–Yan production

Bubanja, I.; Jung, H.; Lelek, A.; Raicevic, N.; Taheri Monfared, S.

Preprint

PUBDB-2025-01694

Center-of-mass energy dependence of intrinsic-$k_{\textrm{T}}$ distributions obtained from Drell–Yan production

Bubanja, I. ; Jung, H. (Corresponding author)Extern*DESY* ; Lelek, A. ; Raicevic, N. ; Taheri Monfared, S.DESY*

2025

[10.3204/PUBDB-2025-01694]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-01694

Report No.: DESY-24-049; arXiv:2404.04088

Abstract: The internal motion of partons inside hadrons has been studied through its impact on very low transverse momentum spectra of Drell–Yan (DY) pairs created in hadron-hadron collisions. We study DY production at next-to-leading order using the Parton Branching (PB) method which describes the evolution of transverse momentum dependent parton distributions. The main focus is on studying the intrinsic transverse momentum distribution (intrinsic-$k_{\textrm{T}}$) as a function of the center-of-mass energy $\sqrt{s}$. While collinear parton shower Monte Carlo event generators require intrinsic transverse momentum distributions strongly dependent on $\sqrt{s}$, this is not the case for the PB method. We perform a detailed study of the impact of soft parton emissions. We show that by requiring a minimal transverse momentum, $q_0$, of a radiated parton, a dependence of the width of the intrinsic-$k_{\textrm{T}}$ distribution as a function of $\sqrt{s}$ is observed. This dependence becomes stronger with increasing $q_0$.

Keyword(s): transverse momentum: momentum spectrum ; higher-order: 1 ; transverse momentum: low ; parton: showers ; parton: distribution function ; Monte Carlo ; Drell-Yan process ; transverse momentum dependence ; collinear ; energy dependence ; hadron hadron: scattering ; hadron: colliding beams