NLO QCD corrections in Herwig++ with MC@NLO

TL;DR

This paper details the implementation of NLO QCD corrections in the Herwig++ event generator using the MC@NLO method, enabling more precise simulations for a variety of particle physics processes.

Contribution

It extends MC@NLO capabilities to Herwig++, allowing NLO QCD corrections for all previously supported processes and facilitating broader application with automated NLO matrix element generation.

Findings

Herwig++ implementation matches Fortran HERWIG results

Demonstrates improved accuracy in particle collision simulations

Enables NLO precision for more processes

Abstract

We present the calculations necessary to obtain next-to-leading order QCD precision with the Herwig++ event generator using the MC@NLO approach, and implement them for all the processes that were previously available from Fortran HERWIG with MC@NLO. We show a range of results comparing the two implementations. With these calculations and recent developments in the automatic generation of NLO matrix elements, it will be possible to obtain NLO precision with Herwig++ for a much wider range of processes