Merging High Energy with Soft and Collinear Logarithms using HEJ and PYTHIA

TL;DR

This paper introduces a method to combine the all-order high energy jets approach with Pythia8's parton shower, enhancing event realism and improving observable descriptions across different transverse scales.

Contribution

It presents a novel technique to merge HEJ and Pythia8, maintaining their respective logarithmic accuracies for more accurate event simulation.

Findings

Improved description of observables with disparate transverse scales

Generation of fully realistic and hadronised events using combined approach

Enhanced accuracy in high energy jet simulations

Abstract

We present a method to combine the all-order treatment of the High Energy Jets exclusive partonic Monte Carlo (HEJ) with the parton shower of Pythia8, while retaining the logarithmic accuracy of both. This procedure enables the generation of fully realistic and hadronised events with HEJ. Furthermore, the combination of the two all-order treatments leads to improvements in the quality of the description of observables, in particular for regions with disparate transverse scales.