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The ATLAS Inner Detector commissioning and calibration

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The ATLAS Collaboration [--] Aad, Georges [--] Jez, Pavel [UCL]

The ATLAS Inner Detector is a composite tracking system consisting of silicon pixels, silicon strips and straw tubes in a 2 T magnetic field. Its installation was completed in August 2008 and the detector took part in data- taking with single LHC beams and cosmic rays. The initial detector operation, hardware commissioning and in-situ calibrations are described. Tracking performance has been measured with 7.6 million cosmic-ray events, collected using a tracking trigger and reconstructed with modular pattern-recognition and fitting software. The intrinsic hit efficiency and tracking trigger efficiencies are close to 100%. Lorentz angle measurements for both electrons and holes, specific energy-loss calibration and transition radiation turn-on measurements have been performed. Different alignment techniques have been used to reconstruct the detector geometry. After the initial alignment, a transverse impact parameter resolution of 22.1+/-0.9 {mu}m and a relative momentum resolution {sigma}p/p = (4.83+/-0.16) imes 10-4 GeV-1 imes pT have been measured for high momentum tracks.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2010
Language Anglais
Journal information "European Physical Journal C. Particles and Fields" - Vol. 70, no.3, p. 787-821 (2010)
Peer reviewed yes
Publisher Springer ((Germany) Heidelberg)
issn 1434-6044
e-issn 1434-6052
Publication status Publié
Affiliation UCL - SST/IRMP - Institut de recherche en mathématique et physique
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Bibliographic reference The ATLAS Collaboration ; Aad, Georges ; Jez, Pavel ; et. al. The ATLAS Inner Detector commissioning and calibration. In: European Physical Journal C. Particles and Fields, Vol. 70, no.3, p. 787-821 (2010)
Permanent URL http://hdl.handle.net/2078.1/138150