Speaker
Description
In this talk, I will present a phenomenological study aimed at assessing the impact of phenomenological choices in fits of Transverse Momentum Distributions (TMDs). In particular, I will focus on the so-called $b_*$ prescription, which is introduced in the standard Collins-Soper-Sterman (CSS) formalism to avoid the Landau pole. Using low invariant-mass Drell-Yan data, we observe that different choices of $b_*$ provide similarly good descriptions of experimental measurements and compatible behaviors of the extracted TMDs at small and large intrinsic transverse momentum, while significant differences emerge in the intermediate region. I will also discuss the crucial role of high-energy measurements and perturbative benchmarks for extracting reliable TMDs, and briefly comment on advantages and limitations of the $b_{\rm min}$ prescription.