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Faster simulated track reconstruction in the ATLAS Fast Chain

The production of simulated datasets for use by physics analyses consumes a large fraction of ATLAS computing resources, a problem that will only get worse as increases in the instantaneous luminosity provided by the LHC lead to more collisions per bunch crossing (pile-up). One of the more resource-...

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Autores principales: Leight, William Axel, Tsai, Fang-Ying, Javurkova, Martina, Golling, Tobias, Chapman, John Derek, Sengupta, Debajyoti
Lenguaje:eng
Publicado: 2023
Materias:
Acceso en línea:http://cds.cern.ch/record/2871922
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author Leight, William Axel
Tsai, Fang-Ying
Javurkova, Martina
Golling, Tobias
Chapman, John Derek
Sengupta, Debajyoti
author_facet Leight, William Axel
Tsai, Fang-Ying
Javurkova, Martina
Golling, Tobias
Chapman, John Derek
Sengupta, Debajyoti
author_sort Leight, William Axel
collection CERN
description The production of simulated datasets for use by physics analyses consumes a large fraction of ATLAS computing resources, a problem that will only get worse as increases in the instantaneous luminosity provided by the LHC lead to more collisions per bunch crossing (pile-up). One of the more resource-intensive steps in the Monte Carlo production is reconstructing the tracks in the ATLAS Inner Detector, which takes up about 60% of the total detector reconstruction time. This talk discusses a novel technique called track overlay, which substantially speeds up the Inner Detector reconstruction. In track overlay the pile-up Inner Detector tracks are reconstructed ahead of time and overlaid onto the Inner Detector tracks from the simulated hard-scatter event. We present our implementation of this track overlay approach as part of the ATLAS Fast Chain simulation, as well as a method for deciding in which cases it is possible to use track overlay in the reconstruction of simulated data without performance degradation, and in which it is preferable to use the current approach.
id cern-2871922
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2023
record_format invenio
spelling cern-28719222023-09-21T20:54:28Zhttp://cds.cern.ch/record/2871922engLeight, William AxelTsai, Fang-YingJavurkova, MartinaGolling, TobiasChapman, John DerekSengupta, DebajyotiFaster simulated track reconstruction in the ATLAS Fast ChainParticle Physics - ExperimentThe production of simulated datasets for use by physics analyses consumes a large fraction of ATLAS computing resources, a problem that will only get worse as increases in the instantaneous luminosity provided by the LHC lead to more collisions per bunch crossing (pile-up). One of the more resource-intensive steps in the Monte Carlo production is reconstructing the tracks in the ATLAS Inner Detector, which takes up about 60% of the total detector reconstruction time. This talk discusses a novel technique called track overlay, which substantially speeds up the Inner Detector reconstruction. In track overlay the pile-up Inner Detector tracks are reconstructed ahead of time and overlaid onto the Inner Detector tracks from the simulated hard-scatter event. We present our implementation of this track overlay approach as part of the ATLAS Fast Chain simulation, as well as a method for deciding in which cases it is possible to use track overlay in the reconstruction of simulated data without performance degradation, and in which it is preferable to use the current approach.ATL-SOFT-PROC-2023-036oai:cds.cern.ch:28719222023-09-21
spellingShingle Particle Physics - Experiment
Leight, William Axel
Tsai, Fang-Ying
Javurkova, Martina
Golling, Tobias
Chapman, John Derek
Sengupta, Debajyoti
Faster simulated track reconstruction in the ATLAS Fast Chain
title Faster simulated track reconstruction in the ATLAS Fast Chain
title_full Faster simulated track reconstruction in the ATLAS Fast Chain
title_fullStr Faster simulated track reconstruction in the ATLAS Fast Chain
title_full_unstemmed Faster simulated track reconstruction in the ATLAS Fast Chain
title_short Faster simulated track reconstruction in the ATLAS Fast Chain
title_sort faster simulated track reconstruction in the atlas fast chain
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2871922
work_keys_str_mv AT leightwilliamaxel fastersimulatedtrackreconstructionintheatlasfastchain
AT tsaifangying fastersimulatedtrackreconstructionintheatlasfastchain
AT javurkovamartina fastersimulatedtrackreconstructionintheatlasfastchain
AT gollingtobias fastersimulatedtrackreconstructionintheatlasfastchain
AT chapmanjohnderek fastersimulatedtrackreconstructionintheatlasfastchain
AT senguptadebajyoti fastersimulatedtrackreconstructionintheatlasfastchain