The LHCb trigger and its performance in 2011

R. Aaij; J. Albrecht; F. Alessio; S. Amato; E. Aslanides; I. Belyaev; M. Van Beuzekom; E. Bonaccorsi; R. Bonnefoy; L. Brarda; O. Callot; M. Cattaneo; H. Chanal; M. Chebbi; X. Cid Vidal; M. Clemencic; J. Closier; V. Coco; J. Cogan; O. Deschamps; H. Dijkstra; C. Drancourt; R. Dzhelyadin; M. Frank; M. Gandelman; C. Gaspar; V. V. Gligorov; C. Göbel; L. A. Granado Cardoso; Yu Guz; C. Haen; J. He; E. Van Herwijnen; W. Hulsbergen; R. Jacobsson; B. Jost; T. M. Karbach; U. Kerzel; P. Koppenburg; G. Krocker; C. Langenbruch; I. Lax; R. Le Gac; R. Lefèvre; J. Lefrançois; O. Leroy; L. Li Gioi; G. Liu; F. Machefert; I. V. Machikhiliyan; M. Magne; G. Mancinelli; U. Marconi; A. Martín Sánchez; M. -N Minard; S. Monteil; N. Neufeld; V. Niess; S. Oggero; A. Pérez-Calero Yzquierdo; P. Perret; M. Perrin-Terrin; B. Pietrzyk; A. Puig Navarro; G. Raven; P. Robbe; H. Ruiz; M. H. Schune; R. Schwemmer; J. Serrano; I. Shapoval; T. Skwarnicki; B. Souza De Paula; P. Spradlin; S. Stahl; V. K. Subbiah; S. T'Jampens; F. Teubert; C. Thomas; M. Vesterinen; M. Williams; M. Witek; A. Zvyagin

doi:10.1088/1748-0221/8/04/P04022

The LHCb trigger and its performance in 2011

R. Aaij, J. Albrecht, F. Alessio, S. Amato, E. Aslanides, I. Belyaev, M. Van Beuzekom, E. Bonaccorsi, R. Bonnefoy, L. Brarda, O. Callot, M. Cattaneo, H. Chanal, M. Chebbi, X. Cid Vidal, M. Clemencic, J. Closier, V. Coco, J. Cogan, O. DeschampsH. Dijkstra, C. Drancourt, R. Dzhelyadin, M. Frank, M. Gandelman, C. Gaspar, V. V. Gligorov, C. Göbel, L. A. Granado Cardoso, Yu Guz, C. Haen, J. He, E. Van Herwijnen, W. Hulsbergen, R. Jacobsson, B. Jost, T. M. Karbach, U. Kerzel, P. Koppenburg, G. Krocker, C. Langenbruch, I. Lax, R. Le Gac, R. Lefèvre, J. Lefrançois, O. Leroy, L. Li Gioi, G. Liu, F. Machefert, I. V. Machikhiliyan, M. Magne, G. Mancinelli, U. Marconi, A. Martín Sánchez, M. -N Minard, S. Monteil, N. Neufeld, V. Niess, S. Oggero, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, B. Pietrzyk, A. Puig Navarro, G. Raven, P. Robbe, H. Ruiz, M. H. Schune, R. Schwemmer, J. Serrano, I. Shapoval, T. Skwarnicki, B. Souza De Paula, P. Spradlin, S. Stahl, V. K. Subbiah, S. T'Jampens, F. Teubert, C. Thomas, M. Vesterinen, M. Williams, M. Witek, A. Zvyagin

Department of Physics

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454 Scopus citations

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.

Original language	English (US)
Article number	P04022
Journal	Journal of Instrumentation
Volume	8
Issue number	4
DOIs	https://doi.org/10.1088/1748-0221/8/04/P04022
State	Published - Apr 1 2013

Keywords

Trigger algorithms
Trigger concepts and systems (hardware and software)

ASJC Scopus subject areas

Instrumentation
Mathematical Physics

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10.1088/1748-0221/8/04/P04022

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Aaij, R., Albrecht, J., Alessio, F., Amato, S., Aslanides, E., Belyaev, I., Van Beuzekom, M., Bonaccorsi, E., Bonnefoy, R., Brarda, L., Callot, O., Cattaneo, M., Chanal, H., Chebbi, M., Cid Vidal, X., Clemencic, M., Closier, J., Coco, V., Cogan, J., ... Zvyagin, A. (2013). The LHCb trigger and its performance in 2011. Journal of Instrumentation, 8(4), Article P04022. https://doi.org/10.1088/1748-0221/8/04/P04022

Aaij, R, Albrecht, J, Alessio, F, Amato, S, Aslanides, E, Belyaev, I, Van Beuzekom, M, Bonaccorsi, E, Bonnefoy, R, Brarda, L, Callot, O, Cattaneo, M, Chanal, H, Chebbi, M, Cid Vidal, X, Clemencic, M, Closier, J, Coco, V, Cogan, J, Deschamps, O, Dijkstra, H, Drancourt, C, Dzhelyadin, R, Frank, M, Gandelman, M, Gaspar, C, Gligorov, VV, Göbel, C, Granado Cardoso, LA, Guz, Y, Haen, C, He, J, Van Herwijnen, E, Hulsbergen, W, Jacobsson, R, Jost, B, Karbach, TM, Kerzel, U, Koppenburg, P, Krocker, G, Langenbruch, C, Lax, I, Le Gac, R, Lefèvre, R, Lefrançois, J, Leroy, O, Li Gioi, L, Liu, G, Machefert, F, Machikhiliyan, IV, Magne, M, Mancinelli, G, Marconi, U, Martín Sánchez, A, -N Minard, M, Monteil, S, Neufeld, N, Niess, V, Oggero, S, Pérez-Calero Yzquierdo, A, Perret, P, Perrin-Terrin, M, Pietrzyk, B, Puig Navarro, A, Raven, G, Robbe, P, Ruiz, H, Schune, MH, Schwemmer, R, Serrano, J, Shapoval, I, Skwarnicki, T, Souza De Paula, B, Spradlin, P, Stahl, S, Subbiah, VK, T'Jampens, S, Teubert, F, Thomas, C, Vesterinen, M, Williams, M, Witek, M & Zvyagin, A 2013, 'The LHCb trigger and its performance in 2011', Journal of Instrumentation, vol. 8, no. 4, P04022. https://doi.org/10.1088/1748-0221/8/04/P04022

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T1 - The LHCb trigger and its performance in 2011

AU - Aaij, R.

AU - Albrecht, J.

AU - Alessio, F.

AU - Amato, S.

AU - Aslanides, E.

AU - Belyaev, I.

AU - Van Beuzekom, M.

AU - Bonaccorsi, E.

AU - Bonnefoy, R.

AU - Brarda, L.

AU - Callot, O.

AU - Cattaneo, M.

AU - Chanal, H.

AU - Chebbi, M.

AU - Cid Vidal, X.

AU - Clemencic, M.

AU - Closier, J.

AU - Coco, V.

AU - Cogan, J.

AU - Deschamps, O.

AU - Dijkstra, H.

AU - Drancourt, C.

AU - Dzhelyadin, R.

AU - Frank, M.

AU - Gandelman, M.

AU - Gaspar, C.

AU - Gligorov, V. V.

AU - Göbel, C.

AU - Granado Cardoso, L. A.

AU - Guz, Yu

AU - Haen, C.

AU - He, J.

AU - Van Herwijnen, E.

AU - Hulsbergen, W.

AU - Jacobsson, R.

AU - Jost, B.

AU - Karbach, T. M.

AU - Kerzel, U.

AU - Koppenburg, P.

AU - Krocker, G.

AU - Langenbruch, C.

AU - Lax, I.

AU - Le Gac, R.

AU - Lefèvre, R.

AU - Lefrançois, J.

AU - Leroy, O.

AU - Li Gioi, L.

AU - Liu, G.

AU - Machefert, F.

AU - Machikhiliyan, I. V.

AU - Magne, M.

AU - Mancinelli, G.

AU - Marconi, U.

AU - Martín Sánchez, A.

AU - -N Minard, M.

AU - Monteil, S.

AU - Neufeld, N.

AU - Niess, V.

AU - Oggero, S.

AU - Pérez-Calero Yzquierdo, A.

AU - Perret, P.

AU - Perrin-Terrin, M.

AU - Pietrzyk, B.

AU - Puig Navarro, A.

AU - Raven, G.

AU - Robbe, P.

AU - Ruiz, H.

AU - Schune, M. H.

AU - Schwemmer, R.

AU - Serrano, J.

AU - Shapoval, I.

AU - Skwarnicki, T.

AU - Souza De Paula, B.

AU - Spradlin, P.

AU - Stahl, S.

AU - Subbiah, V. K.

AU - T'Jampens, S.

AU - Teubert, F.

AU - Thomas, C.

AU - Vesterinen, M.

AU - Williams, M.

AU - Witek, M.

AU - Zvyagin, A.

PY - 2013/4/1

Y1 - 2013/4/1

N2 - 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.

AB - 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.

KW - Trigger algorithms

KW - Trigger concepts and systems (hardware and software)

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U2 - 10.1088/1748-0221/8/04/P04022

DO - 10.1088/1748-0221/8/04/P04022

M3 - Article

AN - SCOPUS:84877772005

SN - 1748-0221

VL - 8

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 4

M1 - P04022

ER -

The LHCb trigger and its performance in 2011

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Keywords

ASJC Scopus subject areas

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