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Journal Articles Journal of Instrumentation Year : 2013

The LHCb Trigger and its Performance in 2011

R. Aaij
  • Function : Author
J. He
J. Cogan
O. Leroy
J. Serrano


The LHCb trigger and its performance based on data taken at the LHC in 2011 is presented. LHCb is designed to perform flavour physics measurements, and its trigger distinguishes charm and beauty decays from the light quark background. It uses a combination of lepton identification of particles, transverse momentum of particles and selects particles originating from hadrons which decay after a finite flight distance. The trigger reduces the $\sim 11$ MHz of bunch-bunch crossings with at least one non-elastic pp-interaction to 3 kHz of events which are written to storage in two trigger levels. The first level is implemented in hardware, while the next level is a software application which runs on all processors of a large computer farm. A data driven method is used to evaluate the performance of the trigger for several charm and beauty decay modes.

Dates and versions

in2p3-00754928 , version 1 (20-11-2012)



R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. The LHCb Trigger and its Performance in 2011. Journal of Instrumentation, 2013, 8, pp.P04022. ⟨10.1088/1748-0221/8/04/P04022⟩. ⟨in2p3-00754928⟩
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