Application of TMD parton showers obtained with the Parton Branching approach to Drell Yan + jets production

TL;DR

This paper demonstrates that combining TMD parton showers from the Parton Branching approach with NLO calculations accurately describes Drell-Yan and Z+jet production data across various experiments and kinematic ranges.

Contribution

It introduces a method to integrate PB-TMD parton showers with NLO calculations and a new TMD merging algorithm for improved predictions.

Findings

Excellent agreement with E605, R209, PHENIX, CMS, and ATLAS data.

TMD parton shower significantly affects jet multiplicity predictions.

New merging algorithm enables consistent combination with LO matrix elements.

Abstract

Calculations of Drell-Yan (DY) production at next-to-leading (NLO) order have been combined with Transverse Momentum Dependent (TMD) distributions obtained with the Parton Branching (PB). The predictions show a remarkable agreement with DY measurement from E605 experiment, consistent with previous results we obtained for R209, PHENIX, CMS and ATLAS experiments. We also present predictions for Z+jet measurements showing the importance of TMD parton shower contributions to the jet multiplicity. We show that PB-TMD parton density and the corresponding PB-TMD parton shower can be combined with leading-order (LO) matrix element using the newly developed TMD merging algorithm to obtain a very good description of measurements over a wide kinematic range.