The LHCb trigger and its performance in 2011
- R. Aaij
- J. Albrecht
- F. Alessio
- SAS. Amato
- E. Aslanides
- I. Belyaev
- M. van Beuzekom
- Enrico Bonaccorsi
- R. Bonnefoy
- Loïc Brarda
- O. H. Callot
- M. Cattaneo
- H. Chanal
- M Chebbi
- Xabier Cid Vidal
- M. Clemencic
- J. Closier
- V. Coco
- J. Cogan
- O. Deschamps
- H. Dijkstra
- C. Drancourt
- R. Dzhelyadin
- M. Frank
- M. Gandelman
- C. Gaspar
- Vladimir Vava Gligorov
- CGCarla Göbel
- L. A. Granado Cardoso
- Yu. Guz
- Christophe Haen
- Jibo He
- E. van Herwijnen
- W. Hulsbergen
- R. Jacobsson
- B. Jost
- T. M. Karbach
- U. Kerzel
- P. Koppenburg
- G. Krocker
- Christoph Langenbruch
- I. Lax
- R. Le Gac
- R. Lefèvre
- J. Lefrançois
- O. Leroy
- L. Li Gioi
- G Liu
- Frederic Machefert
- I. V. Machikhiliyan
- Magali Magne
- Giampiero Mancinelli
- U. Marconi
- A. Martín Sánchez
- M.-N. Minard
- S. Monteil
- N. Neufeld
- V. Niess
- S. Oggero
- A. Pérez-Calero Yzquierdo
- P. Perret
- Mathieu Perrin-Terrin
- B. Pietrzyk
- Albert Puig Navarro
- Gerhard Raven
- P. Robbe
- H. Ruiz
- M -H Schune
- R. Schwemmer
- J. Serrano
- Illya Shapoval
- T. Skwarnicki
- L. De Paula
- P. Spradlin
- S. Stahl
- V. K. Subbiah
- Stephane T'Jampens
- FREDERIC TEUBERT
- C. Thomas
- MVM. Vesterinen
- Mike Williams
- Mariusz Witek
- A. Zvyagin
Journal of Instrumentation · 2013 · Institute of Physics
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Abstract
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 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.