TY - JOUR
T1 - Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
AU - Gibson, Stephen
AU - The ATLAS Collaboration
N1 - I am one of the four main authors ("ATLAS editors") who wrote this paper. My main contribution was to study LHC beam backgrounds with the ATLAS Pixel Detector. I developed the beam background pixel-based tagging algorithm, performed the data analysis, produced the plots and I wrote the chapter on pixel beam backgrounds in this paper. I have also collaborated on the other studies on 2011 data and simulations in this paper, as a member of the working group on ATLAS non-collision backgrounds since 2010 (and I was a main editor of the referenced earlier conference note on 2010 data).
PY - 2013/7/17
Y1 - 2013/7/17
N2 - 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. Trigger-rate 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.
AB - 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. Trigger-rate 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.
U2 - 10.1088/1748-0221/8/07/P07004
DO - 10.1088/1748-0221/8/07/P07004
M3 - Article
SN - 1748-0221
VL - 8
JO - Journal of Instrumentation
JF - Journal of Instrumentation
M1 - P07004
ER -