Phenomenology of unpolarized TMDs from Semi-Inclusive DIS data

TL;DR

This paper investigates the flavor dependence of unpolarized TMD distribution and fragmentation functions using SIDIS data, revealing notable flavor effects in TMD FFs and highlighting the need for QCD evolution considerations.

Contribution

It introduces a flavor-dependent Gaussian model for TMDs and analyzes semi-inclusive DIS data to identify flavor-specific behaviors, especially in TMD fragmentation functions.

Findings

Flavor dependence observed in TMD fragmentation functions.

Weaker flavor dependence in TMD PDFs, requiring further study.

Highlights the importance of QCD evolution in analyzing new data sets.

Abstract

We discuss the dependence on the flavor of the intrinsic transverse momentum in unpolarized transverse-momentum-dependent distribution functions (TMD PDFs) and fragmentation functions (TMD FFs) analyzing data of semi-inclusive deep-inelastic scattering (SIDIS) released by the HERMES collaboration. Adopting a flavor-dependent Gaussian model in the transverse momentum and neglecting QCD evolution, we find interesting evidences concerning the flavor dependence in TMD FFs, whereas the indications are weaker in TMD PDFs and deserve further investigations. Inclusions of new data sets of SIDIS, electron-positron annihilations and and Drell-Yan (DY) events require a proper treatment of QCD evolution. We try to get constraints on the non-perturbative Sudakov factor from electron-positron annihilations into hadrons.