A measurement of material in the ATLAS tracker using secondary hadronic interactions in 7TeV pp collisions

M Aaboud, G Aad, B. Abbott, J Abdallah, O Abdinov, B Abeloos, Torsten Åkesson, Simona Bocchetta, LENE BRYNGEMARK, Caterina Doglioni, Anders Floderus, Vincent Hedberg, Göran Jarlskog, Else Lytken, Ulf Mjörnmark, Oxana Smirnova, Oleksandr Viazlo

Research output: Contribution to journalArticlepeer-review


Knowledge of the material in the ATLAS inner tracking detector is crucial in understanding the reconstruction of charged-particle tracks, the performance of algorithms that identify jets containing b-hadrons and is also essential to reduce background in searches for exotic particles that can decay within the inner detector volume. Interactions of primary hadrons produced in pp collisions with the material in the inner detector are used to map the location and amount of this material. The hadronic interactions of primary particles may result in secondary vertices, which in this analysis are reconstructed by an inclusive vertex-finding algorithm. Data were collected using minimum-bias triggers by the ATLAS detector operating at the LHC during 2010 at centre-of-mass energy √s = 7TeV, and correspond to an integrated luminosity of 19nb-1. Kinematic properties of these secondary vertices are used to study the validity of the modelling of hadronic interactions in simulation. Secondary-vertex yields are compared between data and simulation over a volume of about 0.7 m3 around the interaction point, and agreement is found within overall uncertainties. © CERN 2016 for the benefit of the ATLAS collaboration, published under the terms of the Creative CommonsAttribution 3.0 License by IOP Publishing Ltd and Sissa Medialab srl.
Original languageEnglish
Article numberP11020
JournalJournal of Instrumentation
Issue number11
Publication statusPublished - 2016

Bibliographical note

Export Date: 13 July 2017

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc)
  • Performance of high energy physics detectors
  • Elementary particles
  • Hadrons
  • High energy physics
  • Centre-of-mass energies
  • Hadronic interactions
  • High energy physics detector
  • Integrated luminosity
  • Kinematic properties
  • Modelling and simulations
  • Performance of algorithm
  • Secondary vertices
  • Tellurium compounds


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