Determination and application of TMD parton densities using the Parton Branching method

TL;DR

This paper determines TMD parton densities at NLO using the Parton Branching method from HERA data, and applies these densities to LHC processes, highlighting the impact of the strong coupling scale choice.

Contribution

It introduces a novel determination of TMD parton densities using the Parton Branching method with two different scale scenarios, and demonstrates their application to LHC processes.

Findings

Different scale choices significantly affect the Drell-Yan pT spectrum.

The method provides consistent TMD densities compatible with HERA data.

Application to LHC processes shows the relevance of scale selection.

Abstract

We present a determination of parton densities at NLO obtained with the Parton Branching method using precision measurements of deep inelastic scattering cross sections at HERA. The two sets of parton densities shown in this work are obtained with the same angular angular ordering condition for the evolution scale and they differ in the chosen scale for the strong coupling evaluation, for which we consider two scenarios: the evolution scale, and the transverse momentum qT from the angular ordering prescription. The transverse momentum dependent densities obtained with the Parton Branching method are applied to two LHC processes: the Drell-Yan pT spectrum and the azimuthal correlation in high pT dijet events. For the Drell-Yan pT spectrum a significant effect from the strong coupling scale choice is observed.