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Unweighting multijet event generation using factorisation-aware neural networks

Janßen, Timo; Maître, Daniel; Schumann, Steffen; Siegert, Frank; Truong, Henry

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Authors

Timo Janßen

Steffen Schumann

Frank Siegert

Profile image of Henry Truong

Henry Truong henry.truong@durham.ac.uk
PGR Student Doctor of Philosophy



Abstract

In this article we combine a recently proposed method for factorisation-aware matrix element surrogates with an unbiased unweighting algorithm. We show that employing a sophisticated neural network emulation of QCD multijet matrix elements based on dipole factorisation can lead to a drastic acceleration of unweighted event generation. We train neural networks for a selection of partonic channels contributing at the tree-level to Z+4,5 jets and t¯t + 3, 4 jets production at the LHC which necessitates a generalisation of the dipole emulation model to include initial state partons as well as massive final state quarks. We also present first steps towards the emulation of colour-sampled amplitudes. We incorporate these emulations as fast and accurate surrogates in a two-stage rejection sampling algorithm within the SHERPA Monte Carlo that yields unbiased unweighted events suitable for phenomenological analyses and post-processing in experimental workflows, e.g. as input to a time-consuming detector simulation. For the computational cost of unweighted events we achieve a reduction by factors between 16 and
350 for the considered channels.

Citation

Janßen, T., Maître, D., Schumann, S., Siegert, F., & Truong, H. (2023). Unweighting multijet event generation using factorisation-aware neural networks. SciPost Physics, 15(3), Article 107. https://doi.org/10.21468/scipostphys.15.3.107

Journal Article Type Article
Acceptance Date Jul 20, 2023
Online Publication Date Sep 21, 2023
Publication Date Sep 21, 2023
Deposit Date Mar 15, 2024
Publicly Available Date Mar 15, 2024
Journal SciPost Physics
Print ISSN 2542-4653
Electronic ISSN 2542-4653
Publisher SciPost
Peer Reviewed Peer Reviewed
Volume 15
Issue 3
Article Number 107
DOI https://doi.org/10.21468/scipostphys.15.3.107
Keywords General Physics and Astronomy
Public URL https://durham-repository.worktribe.com/output/2269875

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