MUSELLI , Claudio

We present a combined resummation for the transverse momentum distribution of a colorless final state in perturbative QCD, expressed as a function of transverse momentum pT and the scaling variable x. Its expression satisfies three requirements: it reduces to standard transverse momentum resummation to any desired logarithmic order in the limit...

In global fits of parton distribution functions (PDFs) a large fraction of data points, mostly from the HERA collider, lies in a region of x and Q2that is sensitive to small-x logarithmic enhancements. Thus, the proper theoretical description of these data requires the inclusion of small-x resummation. In this work we provide all the necessary...