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Title

Alignment of the ATLAS Inner Detector in Run 2

AuthorsATLAS Collaboration; Aparisi, Pozo, J.A.; Bailey, A.J.; Cabrera, Susana ; Castillo, F.L.; Castillo Mª Victoria; Costa, María José ; Escobar, Carlos ; Estrada, Oscar; Ferrer, Antonio ; Fiorini, L. ; Fullana, Esteban ; Fuster, Juan ; García García, Carmen ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Gonzalvo Rodríguez, Galo Rafael; Guerrero Rojas, J.G.R.; Higón, Emilio ; Lacasta Llácer, Carlos ; Lozano Bahilo, José J.; Madaffari, Daniele; Mamuzic, Judita; Martí García, Salvador ; Martinez Agullo, Pablo; Mitsou, Vasiliki A. ; Moreno Llácer, María ; Navarro Gonzalez, Josep; Poveda Torres, Joaquin; Prades Ibañez, Alberto; Rodriguez Bosca, S.; Ruiz Martínez, Arantxa ; Salt, José ; Santra, A.; Sayago Galvan, Ivan; Soldevila, Urmila ; Valero, Alberto ; Sánchez Martínez, Javier ; Torró Pastor, Emma ; Valero, Alberto ; Valls Ferrer, Juan Antonio ; Vos, Marcel
Issue DateDec-2020
PublisherSpringer
CitationEuropean Physical Journal C 80: 1194 (2020)
AbstractThe performance of the ATLAS Inner Detector alignment has been studied using pp collision data at s=13TeV 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. The residual sagitta bias and momentum scale bias after alignment are reduced to less than ∼0.1TeV-1 and 0.9 × 10 , respectively. Impact parameter biases are also evaluated using tracks within jets.
Publisher version (URL)http://dx.doi.org/10.1140/epjc/s10052-020-08700-6
URIhttp://hdl.handle.net/10261/229843
Identifiersdoi: 10.1140/epjc/s10052-020-08700-6
issn: 1434-6052
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