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Mapping the material in the LHCb vertex locator using secondary hadronic interactions

Research output: Contribution to journalArticle

  • M. Alexander
  • W. Barter
  • A. Bay
  • L. J. Bel
  • M. Van Beuzekom
  • G. Bogdanova
  • S. Borghi
  • T. J.V. Bowcock
  • E. Buchanan
  • J. Buytaert
  • K. Carvalho Akiba
  • S. Chen
  • V. Coco
  • P. Collins
  • A. Crocombe
  • F. Da Cunha Marinho
  • E. Dall'Occo
  • S. De Capua
  • C. T. Dean
  • F. Dettori
  • D. Dossett
  • K. Dreimanis
  • G. Dujany
  • L. Eklund
  • T. Evans
  • M. Ferro-Luzzi
  • M. Gersabeck
  • T. Gershon
  • T. Hadavizadeh
  • J. Harrison
  • K. Hennessy
  • W. Hulsbergen
  • D. Hutchcroft
  • P. Ilten
  • E. Jans
  • M. John
  • P. Kopciewicz
  • P. Koppenburg
  • G. Lafferty
  • T. Latham
  • A. Leflat
  • M. W. Majewski
  • R. McNulty
  • J. Mylroie-Smith
  • A. Oblakowska-Mucha
  • C. Parkes
  • A. Pearce
  • A. Poluektov
  • A. Pritchard
  • W. Qian
  • S. Redford
  • S. Richards
  • K. Rinnert
  • E. Rodrigues
  • G. Sarpis
  • M. Schiller
  • H. Schindler
  • M. Smith
  • N. A. Smith
  • T. Szumlak
  • J. J. Velthuis
  • V. Volkov
  • C. Wallace
  • H. M. Wark
  • A. Webber
  • M. R.J. Williams
  • M. Williams
Original languageEnglish
Article numberP06008
Number of pages13
JournalJournal of Instrumentation
Issue number6
Early online date13 Jun 2018
DateAccepted/In press - 22 May 2018
DateE-pub ahead of print - 13 Jun 2018
DatePublished (current) - Jun 2018


Precise knowledge of the location of the material in the LHCb vertex locator (VELO) is essential to reducing background in searches for long-lived exotic particles, and in identifying jets that originate from beauty and charm quarks. Secondary interactions of hadrons produced in beam-gas collisions are used to map the location of material in the VELO. Using this material map, along with properties of a reconstructed secondary vertex and its constituent tracks, a p-value can be assigned to the hypothesis that the secondary vertex originates from a material interaction. A validation of this procedure is presented using photon conversions to dimuons.

    Research areas

  • Particle tracking detectors, Performance of High Energy Physics Detectors

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