Non-perturbative structure of semi-inclusive deep-inelastic and Drell-Yan scattering at small transverse momentum

TL;DR

This paper analyzes semi-inclusive deep inelastic scattering and Drell-Yan processes using TMD factorization, extracting universal non-perturbative distributions and evolution kernels through comprehensive data fitting.

Contribution

It provides the first simultaneous fit of multiple data points to extract universal TMD distributions and the non-perturbative evolution kernel, confirming their universality.

Findings

Successful extraction of unpolarized TMD distributions.

Confirmation of universality of TMD non-perturbative distributions.

Detailed phenomenological analysis of parameter sensitivities.

Abstract

We consider semi-inclusive deep inelastic scattering (SIDIS) and Drell-Yan events within transverse momentum dependent (TMD) factorization. Based on the simultaneous fit of multiple data points, we extract the unpolarized TMD distributions and the non-perturbative evolution kernel. The high quality of the fit confirms a complete universality of TMD non-perturbative distributions. The extraction is supplemented by phenomenological analyses of various parts of the TMD factorization, such as sensitivity to non-perturbative parameterizations, perturbative orders, collinear distributions, correlations between parameters, and others.