Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run

The ATLAS Collaboration

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag and remove background contaminated events in data. Triggerrate based monitoring of beam-related backgrounds is presented. The correlations of backgrounds with machine conditions, such as residual pressure in the beam-pipe, are discussed. Results from dedicated beam-background simulations are shown, and their qualitative agreement with data is evaluated. Data taken during the passage of unpaired, i.e. non-colliding, proton bunches is used to obtain background-enriched data samples. These are used to identify characteristic features of beam-induced backgrounds, which then are exploited to develop dedicated background tagging tools. These tools, based on observables in the Pixel detector, the muon spectrometer and the calorimeters, are described in detail and their efficiencies are evaluated. Finally an example of an application of these techniques to a monojet analysis is given, which demonstrates the importance of such event cleaning techniques for some new physics searches.

Original languageEnglish
Article numberP07004
JournalJournal of Instrumentation
Volume8
Issue number7
DOIs
Publication statusPublished - Jan 1 2013

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Protons
Detector
Detectors
protons
detectors
Calorimeters
Spectrometers
Cleaning
Physics
Pixels
Pipe
Monitoring
cleaning
marking
calorimeters
muons
Calorimeter
pixels
Background
spectrometers

All Science Journal Classification (ASJC) codes

  • Mathematical Physics
  • Instrumentation

Cite this

Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run. / The ATLAS Collaboration.

In: Journal of Instrumentation, Vol. 8, No. 7, P07004, 01.01.2013.

Research output: Contribution to journalArticle

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abstract = "This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag and remove background contaminated events in data. Triggerrate based monitoring of beam-related backgrounds is presented. The correlations of backgrounds with machine conditions, such as residual pressure in the beam-pipe, are discussed. Results from dedicated beam-background simulations are shown, and their qualitative agreement with data is evaluated. Data taken during the passage of unpaired, i.e. non-colliding, proton bunches is used to obtain background-enriched data samples. These are used to identify characteristic features of beam-induced backgrounds, which then are exploited to develop dedicated background tagging tools. These tools, based on observables in the Pixel detector, the muon spectrometer and the calorimeters, are described in detail and their efficiencies are evaluated. Finally an example of an application of these techniques to a monojet analysis is given, which demonstrates the importance of such event cleaning techniques for some new physics searches.",
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AU - Abdallah, J.

AU - Abdel Khalek, S.

AU - Abdelalim, A. A.

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AU - Alhroob, M.

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