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The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects

The ATLAS experiment aims at recording about 1 kHz of physics collisions, starting with an LHC design bunch crossing rate of 40 MHz. To reduce the massive background rate while maintaining a high selection efficiency for rare physics events (such as beyond the Standard Model physics), a two-level tr...

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Detalles Bibliográficos
Autores principales: Ruiz-Martinez, Aranzazu, ATLAS Collaboration
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:http://cds.cern.ch/record/2284295
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author Ruiz-Martinez, Aranzazu
ATLAS Collaboration
author_facet Ruiz-Martinez, Aranzazu
ATLAS Collaboration
author_sort Ruiz-Martinez, Aranzazu
collection CERN
description The ATLAS experiment aims at recording about 1 kHz of physics collisions, starting with an LHC design bunch crossing rate of 40 MHz. To reduce the massive background rate while maintaining a high selection efficiency for rare physics events (such as beyond the Standard Model physics), a two-level trigger system is used. Events are selected based on physics signatures such as presence of energetic leptons, photons, jets or large missing energy. The trigger system exploits topological information, as well as multi-variate methods to carry out the necessary physics filtering. In total, the ATLAS online selection consists of thousands of different individual triggers. A trigger menu is a compilation of these triggers which specifies the physics algorithms to be used during data taking and the bandwidth a given trigger is allocated. Trigger menus reflect not only the physics goals of the collaboration for a given run, but also take into consideration the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout and offline processing farm. For the 2017 run, the ATLAS trigger has been enhanced to be able to handle higher instantaneous luminosities (up to 2.0x10$^{34}$ cm$^{-2}$s$^{-1}$) and to ensure the selection robustness against higher average multiple interactions per bunch crossing. In this presentation, we describe the design criteria for the trigger menus used for Run 2 at the LHC. We discuss several aspects of the process, from the validation of the algorithms, the fine-tuning of the prescales, and the monitoring tools that ensure the smooth operation of the trigger during data-taking. We also report on the physics performance of a few trigger algorithms.
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spelling cern-22842952019-09-30T06:29:59Zhttp://cds.cern.ch/record/2284295engRuiz-Martinez, AranzazuATLAS CollaborationThe ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational AspectsParticle Physics - ExperimentThe ATLAS experiment aims at recording about 1 kHz of physics collisions, starting with an LHC design bunch crossing rate of 40 MHz. To reduce the massive background rate while maintaining a high selection efficiency for rare physics events (such as beyond the Standard Model physics), a two-level trigger system is used. Events are selected based on physics signatures such as presence of energetic leptons, photons, jets or large missing energy. The trigger system exploits topological information, as well as multi-variate methods to carry out the necessary physics filtering. In total, the ATLAS online selection consists of thousands of different individual triggers. A trigger menu is a compilation of these triggers which specifies the physics algorithms to be used during data taking and the bandwidth a given trigger is allocated. Trigger menus reflect not only the physics goals of the collaboration for a given run, but also take into consideration the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout and offline processing farm. For the 2017 run, the ATLAS trigger has been enhanced to be able to handle higher instantaneous luminosities (up to 2.0x10$^{34}$ cm$^{-2}$s$^{-1}$) and to ensure the selection robustness against higher average multiple interactions per bunch crossing. In this presentation, we describe the design criteria for the trigger menus used for Run 2 at the LHC. We discuss several aspects of the process, from the validation of the algorithms, the fine-tuning of the prescales, and the monitoring tools that ensure the smooth operation of the trigger during data-taking. We also report on the physics performance of a few trigger algorithms.ATL-DAQ-SLIDE-2017-774oai:cds.cern.ch:22842952017-09-15
spellingShingle Particle Physics - Experiment
Ruiz-Martinez, Aranzazu
ATLAS Collaboration
The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects
title The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects
title_full The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects
title_fullStr The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects
title_full_unstemmed The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects
title_short The ATLAS Run-2 Trigger Menu for higher luminosities: Design, Performance and Operational Aspects
title_sort atlas run-2 trigger menu for higher luminosities: design, performance and operational aspects
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2284295
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