The parton branching method is crucial for Monte Carlo generators, which are essential for high-energy physics predictions. We examine the impact of soft gluons on inclusive collinear and Transverse Momentum Dependent (TMD) parton densities. By applying the Parton-Branching (PB) method, we identify the non-perturbative Sudakov form factor with the integration range $z \to 1$, which is often neglected in collinear parton shower approaches.
The significance of soft gluons is demonstrated through the transverse momentum spectrum of Drell-Yan lepton pairs, resulting in an intrinsic-$k_T$ distribution width that remains independent of $\sqrt{s}$, contrary to observations in collinear parton shower approaches. This behavior is attributed to the non-perturbative Sudakov form factor.
Volume 469 -
31st International Workshop on Deep Inelastic Scattering (DIS2024) -
WG1: Structure Functions and Parton Densities
Recent Progress in Transverse Momentum-Dependent Parton Densities and Corresponding Parton Showers
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Pre-published on:
December 27, 2024
Published on:
January 16, 2025
Abstract
DOI: https://doi.org/10.22323/1.469.0041
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.