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

Aad, G.; Borjanović, Iris; Božović-Jelisavčić, Ivanka; Ćirković, Predrag; Agatonović-Jovin, Tatjana; Krstić, Jelena; Mamužić, Judita; Popović, D. S.; Sijacki, Dj.; Simić, Lj.; Vranješ, Nenad; Vranješ Milosavljević, Marija; Živković, Lada

doi:10.1088/1748-0221/8/07/P07004

2013

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ATLAS Collaboration (ukupan broj autora: 2914)

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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. 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 i...

Keywords:

Pattern recognition / Performance of High Energy Physics Detectors / accelerator modelling and simulations (multi-particle dynamics / single-particle dynamics) / Analysis and statistical methods / cluster finding / calibration and fitting methods

Source:
Journal of Instrumentation, 2013, 8

Funding / projects:

ANPCyT, Argentina, YerPhI, Armenia, ARC, Australia, BMWF, Austria, FWF, Austria, ANAS, Azerbaijan, SSTC, Belarus, CNPq, Brazil, FAPESP, Brazil, NSERC, Canada, NRC, Canada, CFI, Canada, CERN, CONICYT, Chile, CAS, China, MOST, China, NSFC, China, COLCIENCIAS, Colombia, MSMT CR, Czech Republic, MPO CR, Czech Republic, VSC CR, Czech Republic, DNRF, Denmark, DNSRC, Denmark, Lundbeck Foundation, Denmark, EPLANET, ERC, NSRF, European Union, IN2P3-CNRS, France, CEA-DSM/IRFU, France, GNSF, Georgia, BMBF, Germany, DFG, Germany, HGF, Germany, MPG, Germany, AvH Foundation, Germany, GSRT, Greece, NSRF, Greece, ISF, Israel, MINERVA, Israel, GIF, Israel, DIP, Israel, Benoziyo Center, Israel, INFN, Italy, MEXT, Japan, JSPS, Japan, CNRST, Morocco, FOM, Netherlands, NWO, Netherlands, BRF, Norway, RCN, Norway, MNiSW, Poland, GRICES, Portugal, FCT, Portugal, MERYS (MECTS), Romania, MES of Russia, Russian Federation, ROSATOM, Russian Federation, JINR, MSTD, Serbia, MSSR, Slovakia, ARRS, Slovenia, MIZS, Slovenia, DST/NRF, South Africa, MICINN, Spain, SRC, Sweden, Wallenberg Foundation, Sweden, SER, Switzerland, SNSF, Switzerland, Cantons of Bern and Geneva, Switzerland, NSC, Taiwan, TAEK, Turkey, STFC, United Kingdom, Royal Society, United Kingdom, Leverhulme Trust, United Kingdom, DOE, United States of America, NSF, United States of America, ICREA

DOI: 10.1088/1748-0221/8/07/P07004

ISSN: 1748-0221

WoS: 000322572900015

Scopus: 2-s2.0-84971254240

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TY - JOUR
AU - Aad, G.
AU - Borjanović, Iris
AU - Božović-Jelisavčić, Ivanka
AU - Ćirković, Predrag
AU - Agatonović-Jovin, Tatjana
AU - Krstić, Jelena
AU - Mamužić, Judita
AU - Popović, D. S.
AU - Sijacki, Dj.
AU - Simić, Lj.
AU - Vranješ, Nenad
AU - Vranješ Milosavljević, Marija
AU - Živković, Lada
PY - 2013
UR - https://vinar.vin.bg.ac.rs/handle/123456789/5608
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.
T2 - Journal of Instrumentation
T1 - Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
VL - 8
DO - 10.1088/1748-0221/8/07/P07004
ER -

@article{
author = "Aad, G. and Borjanović, Iris and Božović-Jelisavčić, Ivanka and Ćirković, Predrag and Agatonović-Jovin, Tatjana and Krstić, Jelena and Mamužić, Judita and Popović, D. S. and Sijacki, Dj. and Simić, Lj. and Vranješ, Nenad and Vranješ Milosavljević, Marija and Živković, Lada",
year = "2013",
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. 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.",
journal = "Journal of Instrumentation",
title = "Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run",
volume = "8",
doi = "10.1088/1748-0221/8/07/P07004"
}

Aad, G., Borjanović, I., Božović-Jelisavčić, I., Ćirković, P., Agatonović-Jovin, T., Krstić, J., Mamužić, J., Popović, D. S., Sijacki, Dj., Simić, Lj., Vranješ, N., Vranješ Milosavljević, M.,& Živković, L.. (2013). Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run. in Journal of Instrumentation, 8.
https://doi.org/10.1088/1748-0221/8/07/P07004

Aad G, Borjanović I, Božović-Jelisavčić I, Ćirković P, Agatonović-Jovin T, Krstić J, Mamužić J, Popović DS, Sijacki D, Simić L, Vranješ N, Vranješ Milosavljević M, Živković L. Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run. in Journal of Instrumentation. 2013;8.
doi:10.1088/1748-0221/8/07/P07004 .

Aad, G., Borjanović, Iris, Božović-Jelisavčić, Ivanka, Ćirković, Predrag, Agatonović-Jovin, Tatjana, Krstić, Jelena, Mamužić, Judita, Popović, D. S., Sijacki, Dj., Simić, Lj., Vranješ, Nenad, Vranješ Milosavljević, Marija, Živković, Lada, "Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run" in Journal of Instrumentation, 8 (2013),
https://doi.org/10.1088/1748-0221/8/07/P07004 . .