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Upgrading ATLAS Fast Calorimeter Simulation

Producing the very large samples of simulated events required by many physics and performance studies with the ATLAS detector using the full GEANT4 detector simulation is highly CPU intensive. Fast simulation tools are a useful way of reducing CPU requirements when detailed detector simulations are...

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Autor principal: Heath, Matthew Peter
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:http://cds.cern.ch/record/2272777
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author Heath, Matthew Peter
author_facet Heath, Matthew Peter
author_sort Heath, Matthew Peter
collection CERN
description Producing the very large samples of simulated events required by many physics and performance studies with the ATLAS detector using the full GEANT4 detector simulation is highly CPU intensive. Fast simulation tools are a useful way of reducing CPU requirements when detailed detector simulations are not needed. During the LHC Run-1, a fast calorimeter simulation (FastCaloSim) was successfully used in ATLAS. FastCaloSim provides a simulation of the particle energy response at the calorimeter read-out cell level, taking into account the detailed particle shower shapes and the correlations between the energy depositions in the various calorimeter layers. It is interfaced to the standard ATLAS digitization and reconstruction software, and it can be tuned to data more easily than Geant4. Now an improved version of FastCaloSim is in development, incorporating the experience with the version used during Run-1. The new FastCaloSim aims to overcome some limitations of the first version by improving the description of substructure variables for boosted jets, and giving a better performance in the forward calorimeters, which is important for forward jets in vector-boson-fusion topologies. A first prototype is available and is being tested and validated now. ATLAS plans to use this new FastCaloSim parametrisation to simulate several billion events in the upcoming LHC runs. In this poster, we will describe this new FastCaloSim parametrisation.
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spelling cern-22727772019-09-30T06:29:59Zhttp://cds.cern.ch/record/2272777engHeath, Matthew PeterUpgrading ATLAS Fast Calorimeter SimulationParticle Physics - ExperimentProducing the very large samples of simulated events required by many physics and performance studies with the ATLAS detector using the full GEANT4 detector simulation is highly CPU intensive. Fast simulation tools are a useful way of reducing CPU requirements when detailed detector simulations are not needed. During the LHC Run-1, a fast calorimeter simulation (FastCaloSim) was successfully used in ATLAS. FastCaloSim provides a simulation of the particle energy response at the calorimeter read-out cell level, taking into account the detailed particle shower shapes and the correlations between the energy depositions in the various calorimeter layers. It is interfaced to the standard ATLAS digitization and reconstruction software, and it can be tuned to data more easily than Geant4. Now an improved version of FastCaloSim is in development, incorporating the experience with the version used during Run-1. The new FastCaloSim aims to overcome some limitations of the first version by improving the description of substructure variables for boosted jets, and giving a better performance in the forward calorimeters, which is important for forward jets in vector-boson-fusion topologies. A first prototype is available and is being tested and validated now. ATLAS plans to use this new FastCaloSim parametrisation to simulate several billion events in the upcoming LHC runs. In this poster, we will describe this new FastCaloSim parametrisation.ATL-SOFT-SLIDE-2017-405oai:cds.cern.ch:22727772017-07-03
spellingShingle Particle Physics - Experiment
Heath, Matthew Peter
Upgrading ATLAS Fast Calorimeter Simulation
title Upgrading ATLAS Fast Calorimeter Simulation
title_full Upgrading ATLAS Fast Calorimeter Simulation
title_fullStr Upgrading ATLAS Fast Calorimeter Simulation
title_full_unstemmed Upgrading ATLAS Fast Calorimeter Simulation
title_short Upgrading ATLAS Fast Calorimeter Simulation
title_sort upgrading atlas fast calorimeter simulation
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2272777
work_keys_str_mv AT heathmatthewpeter upgradingatlasfastcalorimetersimulation