Parton Shower Uncertainties with Herwig 7: Benchmarks at Leading Order
Johannes Bellm, Graeme Nail, Simon Pl\"atzer, Peter Schichtel, Andrzej, Si\'odmok
TL;DR
This paper compares two different parton shower algorithms in Herwig 7 to identify and benchmark perturbative uncertainties at leading order, providing a foundation for future higher-order improvements.
Contribution
It provides a detailed comparison of angular-ordered and dipole-type parton shower algorithms at leading order within Herwig 7, highlighting sources of perturbative uncertainty.
Findings
Benchmarking of two parton shower algorithms
Identification of dominant sources of perturbative uncertainty
Establishment of a baseline for future higher-order studies
Abstract
We perform a detailed study of the sources of perturbative uncertainty in parton shower predictions within the Herwig 7 event generator. We benchmark two rather different parton shower algorithms, based on angular-ordered and dipole-type evolution, against each other. We deliberately choose leading order plus parton shower as the benchmark setting to identify a controllable set of uncertainties. This will enable us to reliably assess improvements by higher-order contributions in a follow-up work.
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