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arXiv · 2404.04088

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

I. Bubanja·H. Jung·A. Lelek·N. Raicevic·S. Taheri Monfared
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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-$k_T$) 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-$k_T$ distribution as a function of $\sqrt{s}$ is observed. This dependence becomes stronger with increasing $q_0$.

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I. Bubanja, H. Jung, A. Lelek, N. Raicevic, S. Taheri Monfared. 2024-04-05. Center-of-mass energy dependence of intrinsic-$k_T$ distributions obtained from Drell-Yan production. https://doi.org/10.1140/epjc%2Fs10052-025-14021-3

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