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Minimum Bias Trigger in ATLAS

Since the restart of the LHC in November 2009, ATLAS has collected inelastic pp-collisions to perform first measurements on charged particle densities. These measurements will help to constrain various models describing phenomenologically soft parton interactions. Understanding the trigger efficienc...

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Autor principal: Kwee, R E
Lenguaje:eng
Publicado: 2010
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.120.0037
http://cds.cern.ch/record/1312194
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author Kwee, R E
author_facet Kwee, R E
author_sort Kwee, R E
collection CERN
description Since the restart of the LHC in November 2009, ATLAS has collected inelastic pp-collisions to perform first measurements on charged particle densities. These measurements will help to constrain various models describing phenomenologically soft parton interactions. Understanding the trigger efficiencies for different event types are therefore crucial to minimize any possible bias in the event selection. ATLAS uses two main minimum bias triggers, featuring complementary detector components and trigger levels. While a hardware based first trigger level situated in the forward regions with 2.09 < |eta| < 3.8 has been proven to select pp-collisions very efficiently, the Inner Detector based minimum bias trigger uses a random seed on filled bunches and central tracking detectors for the event selection. Both triggers were essential for the analysis of kinematic spectra of charged particles. Their performance and trigger efficiency measurements as well as studies on possible bias sources will be presented.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2010
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spelling cern-13121942019-09-30T06:29:59Zdoi:10.22323/1.120.0037http://cds.cern.ch/record/1312194engKwee, R EMinimum Bias Trigger in ATLASDetectors and Experimental TechniquesSince the restart of the LHC in November 2009, ATLAS has collected inelastic pp-collisions to perform first measurements on charged particle densities. These measurements will help to constrain various models describing phenomenologically soft parton interactions. Understanding the trigger efficiencies for different event types are therefore crucial to minimize any possible bias in the event selection. ATLAS uses two main minimum bias triggers, featuring complementary detector components and trigger levels. While a hardware based first trigger level situated in the forward regions with 2.09 < |eta| < 3.8 has been proven to select pp-collisions very efficiently, the Inner Detector based minimum bias trigger uses a random seed on filled bunches and central tracking detectors for the event selection. Both triggers were essential for the analysis of kinematic spectra of charged particles. Their performance and trigger efficiency measurements as well as studies on possible bias sources will be presented.ATL-DAQ-PROC-2010-055oai:cds.cern.ch:13121942010-12-07
spellingShingle Detectors and Experimental Techniques
Kwee, R E
Minimum Bias Trigger in ATLAS
title Minimum Bias Trigger in ATLAS
title_full Minimum Bias Trigger in ATLAS
title_fullStr Minimum Bias Trigger in ATLAS
title_full_unstemmed Minimum Bias Trigger in ATLAS
title_short Minimum Bias Trigger in ATLAS
title_sort minimum bias trigger in atlas
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.22323/1.120.0037
http://cds.cern.ch/record/1312194
work_keys_str_mv AT kweere minimumbiastriggerinatlas