The LHCb trigger and its performance in 2011

This paper presents the design of the LHCb trigger and its performance on data taken at the LHC in 2011. A principal goal of LHCb is to perform flavour physics measurements, and the trigger is designed to distinguish charm and beauty decays from the light quark background. Using a combination of lepton identification and measurements of the particles' transverse momenta the trigger selects particles originating from charm and beauty hadrons, which typically fly a finite distance before decaying. The trigger reduces the roughly 11 MHz of bunch-bunch crossings that contain at least one inelastic pp interaction to 3 kHz. This reduction takes place in two stages; the first stage is implemented in hardware and the…

• NS
  National Science Foundation
• C
  CERN
• SF
  Science Foundation Ireland
• DF
  Deutsche Forschungsgemeinschaft
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
• NN
  National Natural Science Foundation of China

  Award: IN2P3
• RF
  Russian Foundation for Basic Research
• CD
  Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
• BF
  Bundesministerium für Bildung und Forschung
• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek
• CN
  Conselho Nacional de Desenvolvimento Científico e Tecnológico
• M
  Max-Planck-Gesellschaft
• FC
  Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
• CN
  Centre National de la Recherche Scientifique

  Award: CNRS/IN2P3
• FD
  Financiadora de Estudos e Projetos
• NR
  National Research Center "Kurchatov Institute"
• SA
  Science and Technology Facilities Council

  Awards: IN2P3, ST/K004646/1
• IN
  Institut National de Physique Nucléaire et de Physique des Particules

  Award: CNRS/IN2P3