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

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2013) Journal of Instrumentation — Vol. 8 (2013)

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This paper presents a summary of beam-induced backgroundsobserved in the ATLAS detector and discusses methods to tag andremove background contaminated events in data. Trigger-rate basedmonitoring of beam-related backgrounds is presented. Thecorrelations of backgrounds with machine conditions, such asresidual pressure in the beam-pipe, are discussed. Results fromdedicated beam-background simulations are shown, and theirqualitative agreement with data is evaluated. Data taken during thepassage of unpaired, i.e. non-colliding, proton bunches is used toobtain background-enriched data samples. These are used to identifycharacteristic features of beam-induced backgrounds, which then areexploited to develop dedicated background tagging tools. Thesetools, based on observables in the Pixel detector, the muonspectrometer and the calorimeters, are described in detail and theirefficiencies are evaluated. Finally an example of an application ofthese techniques to a monojet analysis is given, which demonstratesthe importance of such event cleaning techniques for some newphysics searches.
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Tanasijczuk, A. J., ATLAS, & et al. (2013). Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run. Journal of Instrumentation, 8. https://doi.org/10.1088/1748-0221/8/07/P07004 (Original work published 2013)