Transverse momentum dependent (TMD) distributions match collinear parton density functions (PDF) in the limit of small transverse distances, which is accounted for by global extractions of TMD distributions. We study the influence of the collinear PDF value and uncertainties on the determination of unpolarized TMD distributions and the description of Drell-Yan (DY) and Z-boson production measurements at low transverse momenta. We take into account, for the first time, flavor-dependent non-perturbative TMD profiles. We carry out a Bayesian analysis to incorporate the propagation of PDF uncertainties into TMD extractions. We find that collinear PDF uncertainties and non-perturbative TMD flavor dependence are both essential to obtain reliable TMD determinations, and should be included in future global analyses.
@article{arxiv.2201.07114,
title = {PDF bias and flavor dependence in TMD distributions},
author = {Marcin Bury and Francesco Hautmann and Sergio Leal-Gomez and Ignazio Scimemi and Alexey Vladimirov and Pia Zurita},
journal= {arXiv preprint arXiv:2201.07114},
year = {2022}
}
Comments
27 pages, 14 figures, SupplimentaryMaterials.pdf (26 pages) attached to the submission; ver2.: multiple updates to the text