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

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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 30μm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20μm 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. © 2017, CERN for the benefit of the ATLAS collaboration.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Iowa
  • Mohamed Premier University
  • Aix-Marseille University
  • University of Oklahoma
  • Institute of Physics Azerbaijan National Academy of Sciences
  • University of Paris-Sud
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Originalspråkengelska
Artikelnummer332
TidskriftEuropean Physical Journal C
Volym77
Utgåva nummer5
StatusPublished - 2017
PublikationskategoriForskning
Peer review utfördJa