PB TMD fits at NLO with dynamical resolution scale

TL;DR

This paper presents NLO fits of TMD parton distributions using a parton branching formalism that incorporates a dynamical resolution scale, improving the modeling of soft-gluon effects in QCD evolution.

Contribution

It introduces the first NLO accuracy fits of TMD distributions with a dynamical resolution scale, enhancing the understanding of soft-gluon coherence in QCD evolution.

Findings

Successful fits to high-precision DIS data including dynamical resolution scales

Demonstration of soft-gluon coherence effects at NLO in TMD evolution

Improved theoretical description of parton distributions in QCD

Abstract

Parton branching solutions of QCD evolution equations have recently been studied to construct both collinear and transverse momentum dependent (TMD) parton distributions. In this formalism, a soft-gluon resolution scale is introduced to separate resolvable and non-resolvable branchings, and to take into account soft-gluon coherence effects. In this talk, results of fits to the high precision deep inelastic scattering (DIS) structure function measurements are shown including for the first time the effects of dynamical, i.e. branching-scale dependent, resolution scales at Next-to-Leading-Order (NLO) accuracy in the strong coupling.