Accelerating LHC event generation with simplified pilot runs and fast PDFs

Bothmann, E., Buckley, A. , Christidi, I. A., Gütschow, C., Höche, S., Knobbe, M., Martin, T. and Schönherr, M. (2022) Accelerating LHC event generation with simplified pilot runs and fast PDFs. European Physical Journal C, 82(12), 1128. (doi: 10.1140/epjc/s10052-022-11087-1)

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Poor computing efficiency of precision event generators for LHC physics has become a bottleneck for Monte-Carlo event simulation campaigns. We provide solutions to this problem by focusing on two major components of general-purpose event generators: The PDF evaluator and the matrix-element generator. For a typical production setup in the ATLAS experiment, we show that the two can consume about 80% of the total runtime. Using NLO simulations of pp→ℓ+ℓ-+jets and pp→tt¯+jets as an example, we demonstrate that the computing footprint of Lhapdf and Sherpa can be reduced by factors of order 10, while maintaining the formal accuracy of the event sample. The improved codes are made publicly available.

Item Type:Articles
Additional Information:This research was supported by the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. The work of S.H. was supported by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research, Scientific Discovery through Advanced Computing (SciDAC) program. A.B., and M.S. are supported by the UK Science and Technology Facilities Council (STFC) Consolidated Grant programmes ST/S000887/1 and ST/T001011/1, respectively. A.B., I.C., C.G., and M.S. are further supported by the STFC SWIFT-HEP project (grant ST/V002627/1). C.G. wishes to thank Edd Edmondson for technical support and providing exclusive use of a machine for benchmarking. E.B. and M.K. acknowledge support from BMBF (contract 05H21MGCAB) and funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - project number 456104544. M.K. would like to thank the MCnet collaboration for the opportunity to spend a short-term studentship at the University of Glasgow. This work has received funding from the European Union’s Horizon 2020 research and innovation programme as part of the Marie Skłodowska-Curie Innovative Training Network MCnetITN3 (grant agreement no. 722104). M.S. is supported by the Royal Society through a University Research Fellowship (URF \R1\180549) and an Enhancement Award (RGF \ EA\181033, CEC19\100349, and RF\ ERE\210397).
Glasgow Author(s) Enlighten ID:Buckley, Professor Andy and Knobbe, Mr Max
Authors: Bothmann, E., Buckley, A., Christidi, I. A., Gütschow, C., Höche, S., Knobbe, M., Martin, T., and Schönherr, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
ISSN (Online):1434-6052
Published Online:14 December 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in European Physical Journal C 82(12):1128
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302375Particle Physics Experiment (PPE) ConsolidatedAnthony DoyleScience and Technology Facilities Council (STFC)ST/S000887/1P&S - Physics & Astronomy