LHCb CollaborationRuiz, Hugo (Ruiz Pérez)2023-03-272023-03-272013-041748-0221https://hdl.handle.net/2445/196021This 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 second stage is a software application that runs on a large computer farm. A data-driven method is used to evaluate the performance of the trigger on several charm and beauty decay modes.25 p.application/pdfengcc by (c) CERN, 2013http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsGran Col·lisionador d'HadronsParticle physicsExperimentsLarge Hadron Collider (France and Switzerland)info:eu-repo/semantics/article6292572023-03-27info:eu-repo/semantics/openAccess