Abstract
We discuss a first attempt at a global extraction of unpolarized partonic transverse momentum dependent (TMD) distributions and fragmentation functions from a simultaneous fit of data measured in semi-inclusive deep-inelastic scattering, Drell–Yan and Z boson production. This analysis is performed in the low transverse momentum region, at leading order in perturbative QCD. To connect data at different scales, we use TMD evolution at next-to-leading logarithmic accuracy.
Highlights
Parton distribution functions describe the internal structure of the nucleon in terms of its elementary constituents, quarks and gluons
We discuss a first attempt at a global extraction of unpolarized partonic transverse momentum dependent (TMD) distributions and fragmentation functions from a simultaneous fit of data measured in semi-inclusive deep-inelastic scattering, Drell–Yan and Z boson production
Many observables in hadronic hard scattering experiments are related to PDFs and FFs, in a way specified by factorization theorems
Summary
Parton distribution functions describe the internal structure of the nucleon in terms of its elementary constituents, quarks and gluons. Many observables in hadronic hard scattering experiments are related to PDFs and FFs, in a way specified by factorization theorems Availability of measurements of different processes in different experiments makes it possible to test the reliability of factorization theorems and extract PDFs and FFs through so-called global fits. In this contribution to the proceedings, based on [3] to which we refer for details, we focus only on the unpolarized TMD PDF f1q(x, k⊥2 ) and the unpolarized TMD FF D1q→h(z, Ph2T ), with a flavor independent analysis. DIS, and Drell–Yan processes (DY) with the production of virtual photons and Z bosons
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