Recent progress in transverse momentum dependent (TMD) Parton Densities and corresponding parton showers
arXiv:2410.05853
Abstract
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 , 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- distribution width that remains independent of , contrary to observations in collinear parton shower approaches. This behavior is attributed to the non-perturbative Sudakov form factor.
5 pages, 2 Figures. Based on a presentation given at the 31st International Workshop on Deep Inelastic Scattering (DIS2024), 8-12 April 2024, Grenoble, France