Center-of-mass energy dependence of intrinsic- distributions obtained from Drell–Yan production

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

doi:10.1140/epjc/s10052-025-14021-3

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2025) 85: 278
https://doi.org/10.1140/epjc/s10052-025-14021-3

Letter

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

I. Bubanja¹^,2, H. Jung³^,4^a, A. Lelek⁵, N. Raičević¹ and S. Taheri Monfared³

¹ Faculty of Science and Mathematics, University of Montenegro, Podgorica, Montenegro
² Interuniversity Institute for High Energies (IIHE), Université libre de Bruxelles, Bruxelles, Belgium
³ Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
⁴ II. Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany
⁵ University of Antwerp, Antwerp, Belgium

^a hannes.jung@desy.de

Received: 1 October 2024
Accepted: 28 February 2025
Published online: 12 March 2025

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- $k_{T}$ $k_{\textrm{T}}$ ) as a function of the center-of-mass energy $\sqrt{s}$ $\sqrt{s}$ . While collinear parton shower Monte Carlo event generators require intrinsic transverse momentum distributions strongly dependent on $\sqrt{s}$ $\sqrt{s}$ , 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, $q_{0}$ $$q_0$$ , of a radiated parton, a dependence of the width of the intrinsic- $k_{T}$ $k_{\textrm{T}}$ distribution as a function of $\sqrt{s}$ $\sqrt{s}$ is observed. This dependence becomes stronger with increasing $q_{0}$ $$q_0$$ .

© The Author(s) 2025

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