B flavour tagging using charm decays at the LHCb experiment

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  • LHCb Collaboration

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  • CERN
  • Universidad de Santiago de Compostela
  • University of Bristol
  • University of Liverpool
  • LPC
  • IN2P3
  • TU Dortmund University, Germany
  • University of Glasgow
  • Institution Nikhef National Institute for Subatomic Physics
  • Petersburg Nuclear Physics Institute (PNPI)
  • Imperial College London
  • University of Cincinnati
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  • Max-Planck-Institut für Kernphysik (MPIK)
  • Ruprecht-Karls-Universität Heidelberg
  • Institute for High Energy Physics (IHEP)
  • Syracuse University
  • Department of Physics and Astronomy and INFN
  • Università della Basilicata
  • University of Warwick
  • Universitat de Barcelona
  • Pontifícia Universidade Católica Do Rio de Janeiro


An algorithm is described for tagging the flavour content at production of neutral B mesons in the LHCb experiment. The algorithm exploits the correlation of the flavour of a B meson with the charge of a reconstructed secondary charm hadron from the decay of the other b hadron produced in the proton-proton collision. Charm hadron candidates are identified in a number of fully or partially reconstructed Cabibbo-favoured decay modes. The algorithm is calibrated on the self-tagged decay modes B+ → J/ψK+ and B0 → J/ψK∗0 using 3:0fb.-1 of data collected by the LHCb experiment at pp centre-of-mass energies of 7TeV and 8TeV. Its tagging power on these samples of B → J/ψX decays is (0:30±0:01±0:01)%.


Original languageEnglish
Article numberP10005
JournalJournal of Instrumentation
Issue number10
Publication statusPublished - 5 Oct 2015


  • Analysis and statistical methods, Performance of High Energy Physics Detectors

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