Flavor dependence of unpolarized quark Transverse Momentum Distributions from a global fit

TL;DR

This paper performs a high-precision global analysis of unpolarized quark transverse momentum distributions, revealing flavor-dependent differences by combining Drell-Yan and semi-inclusive deep-inelastic scattering data at N$^3$LL accuracy.

Contribution

It introduces a novel extraction method that accounts for flavor differences in TMDs using combined experimental data at advanced perturbative accuracy.

Findings

Flavor-dependent TMDs describe data well (χ²/N_data=1.08)

Uncertainties include collinear distribution uncertainties

Analysis achieves N$^3$LL accuracy

Abstract

We present an extraction of the unpolarized transverse-momentum-dependent parton distribution and fragmentation functions that takes into account possible differences between quark flavors and final-state hadrons. The extraction is based on experimental measurements from Drell-Yan processes and semi-inclusive deep-inelastic scattering, whose combination is essential to distinguish flavor differences. The analysis is carried out at N$^3$LL accuracy. The extracted flavor-dependent distributions give a very good description of the data ($\chi^2/N_{\rm dat} = 1.08$). The resulting uncertainties take fully into account also the uncertainties in the determination of the corresponding collinear distributions.