Emulating the impact of additional proton–proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events
Authors
Abraham, NL
Camelia, EA
Amelung, C
Amrouche, CS
Andrei, V
Anelli, CR
Publication Date
2021-02-18Journal Title
Computing and Software for Big Science
ISSN
2510-2036
Publisher
Springer Science and Business Media LLC
Volume
6
Issue
1
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2021). Emulating the impact of additional proton–proton interactions in the ATLAS simulation by presampling sets of inelastic Monte Carlo events. Computing and Software for Big Science, 6 (1) https://doi.org/10.1007/s41781-021-00062-2
Description
Funder: CERN
Abstract
The accurate simulation of additional interactions at the ATLAS experiment
for the analysis of proton-proton collisions delivered by the Large Hadron
Collider presents a significant challenge to the computing resources. During
the LHC Run (2015-2018) there were up to 70 inelastic interactions per bunch
crossing, which need to be accounted for in Monte Carlo (MC) production. In
this document, a new method to account for these additional interactions in the
simulation chain is described. Instead of sampling the inelastic interactions
and adding their energy deposits to a hard-scatter interaction one-by-one, the
inelastic interactions are presampled, independent of the hard scatter, and
stored as combined events. Consequently, for each hard-scatter interaction only
one such presampled event needs to be added as part of the simulation chain.
For the Run 2 simulation chain, with an average of 35 interactions per bunch
crossing, this new method provides a substantial reduction in MC production CPU
needs of around 20%, while reproducing the properties of the reconstructed
quantities relevant for physics analyses with good accuracy.
Keywords
Original Article
Identifiers
s41781-021-00062-2, 62
External DOI: https://doi.org/10.1007/s41781-021-00062-2
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333370
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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