Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

摘要

We present an extraction of unpolarized partonic transverse momentumdistributions (TMDs) from a simultaneous fit of available data measured insemi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production. Toconnect data at different scales, we use TMD evolution at next-to-leadinglogarithmic accuracy. The analysis is restricted to the low-transverse-momentumregion, with no matching to fixed-order calculations at high transversemomentum. We introduce specific choices to deal with TMD evolution at lowscales, of the order of 1 GeV$^2$. This could be considered as a first attemptat a global fit of TMDs.