Automating the POWHEG method in Sherpa

TL;DR

This paper presents an automated implementation of the POWHEG method within Sherpa, enabling precise simulation of various particle physics processes with minimal manual intervention.

Contribution

The authors developed a fully automated POWHEG implementation in Sherpa, simplifying the simulation of processes with straightforward colour structures.

Findings

Successful simulation of multiple processes including e+e- to hadrons and Higgs production

Automation reduces manual effort to include virtual matrix elements

Demonstrated accuracy and efficiency across diverse test cases

Abstract

A new implementation of the POWHEG method into the Monte-Carlo event generator Sherpa is presented, focusing on processes with a simple colour structure. Results for a variety of processes, namely e+e- to hadrons, deep-inelastic lepton-nucleon scattering, hadroproduction of single vector bosons and of vector boson pairs as well as the production of Higgs bosons in gluon fusion serve as test cases for the successful realisation. The algorithm is fully automated such that for further processes only virtual matrix elements need to be included.