Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton–proton collisions at the LHC

UNSPECIFIED (2017) Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton–proton collisions at the LHC. European Physical Journal C: Particles and Fields, 77 (5): 332. ISSN 1434-6044

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Abstract

This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of √s = 8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measurement of the position and size of the luminous region and its use as a constraint to improve the primary vertex resolution are discussed. A longitudinal vertex position resolution of about 30 µm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20 µm and is dominated by the precision on the size of the luminous region. An analytical model is proposed to describe the primary vertex reconstruction efficiency as a function of the number of interactions per bunch crossing and of the longitudinal size of the luminous region. Agreement between the data and the predictions of this model is better than 3% up to seventy interactions per bunch crossing.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3101
Subjects:
?? physics and astronomy (miscellaneous)engineering (miscellaneous) ??
ID Code:
86919
Deposited By:
Deposited On:
03 Jul 2017 09:20
Refereed?:
Yes
Published?:
Published
Last Modified:
14 Feb 2024 01:03