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Alignment of the ATLAS Inner Detector in Run-2

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    0540750 - FZÚ 2021 RIV DE eng J - Journal Article
    Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek
    Alignment of the ATLAS Inner Detector in Run-2.
    European Physical Journal C. Roč. 80, č. 12 (2020), s. 1-41, č. článku 1194. ISSN 1434-6044
    R&D Projects: GA MŠk(CZ) LM2018104; GA MŠk(CZ) LTT17018
    Institutional support: RVO:68378271
    Keywords : CERN LHC Coll * tracks * impact parameter
    Subject RIV: BF - Elementary Particles and High Energy Physics
    OBOR OECD: Particles and field physics
    Impact factor: 4.389, year: 2019

    The performance of the ATLAS Inner Detector alignment has been studied using pp collision data at sqrt{s} = 13,hbox {TeV} collected by the ATLAS experiment during Run 2 (2015–2018) of the Large Hadron Collider (LHC). The goal of the detector alignment is to determine the detector geometry as accurately as possible and correct for time-dependent movements. The Inner Detector alignment is based on the minimization of track-hit residuals in a sequence of hierarchical levels, from global mechanical assembly structures to local sensors. Subsequent levels have increasing numbers of degrees of freedom, in total there are almost 750,000. The alignment determines detector geometry on both short and long timescales, where short timescales describe movements within an LHC fill. The performance and possible track parameter biases originating from systematic detector deformations are evaluated. Momentum biases are studied using resonances decaying to muons or to electrons.
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