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

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 (${\chi }^2/N_{\mathrm{dat}}=1.08$). The resulting uncertainties take fully into account also the uncertainties in the determination of the corresponding collinear distributions.

arXiv commentUpdated version as published in JHEP

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• Collins-Soper Kernel in the QCD Instanton Vacuum
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