The CMS trigger system

This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is impl...

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Published in	Journal of instrumentation Vol. 12; no. 1; p. P01020
Main Authors	Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V.M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Knünz, V., König, A., Krammer, M., Krätschmer, I., Liko, D., Matsushita, T., Mikulec, I., Rabady, D., Rahbaran, B., Rohringer, H., Schieck, J., Schöfbeck, R., Strauss, J., Treberer-Treberspurg, W., Waltenberger, W., Wulz, C.-E., Mossolov, V., Shumeiko, N., Gonzalez, J. Suarez, Alderweireldt, S., Cornelis, T., Wolf, E.A. De, Janssen, X., Knutsson, A., Lauwers, J., Luyckx, S., Klundert, M. Van De, Haevermaet, H. Van, Mechelen, P. Van, Remortel, N. Van, Spilbeeck, A. Van, Zeid, S. Abu, Blekman, F., D'Hondt, J., Daci, N., Bruyn, I. De, Deroover, K., Heracleous, N., Keaveney, J., Lowette, S., Moreels, L., Olbrechts, A., Python, Q., Strom, D., Tavernier, S., Doninck, W. Van, Mulders, P. Van, Onsem, G.P. Van, Parijs, I. Van, Barria, P., Brun, H., Caillol, C., Clerbaux, B., Lentdecker, G. De, Fasanella, G., Favart, L., Grebenyuk, A., Karapostoli, G., Lenzi, T., Léonard, A., Maerschalk, T., Marinov, A., Perniè, L., Randle-conde, A., Reis, T., Seva, T., Velde, C. Vander, Vanlaer, P., Yonamine, R., Zenoni, F., Zhang, F., Beernaert, K., Benucci, L., Cimmino, A., Crucy, S., Dobur, D., Fagot, A., Garcia, G., Gul, M., Mccartin, J., Rios, A.A. Ocampo, Poyraz, D.
Format	Journal Article
Language	English
Published	United States IOP Publishing 24.01.2017 Institute of Physics (IOP)
Subjects	Algorithms Computer programs Detectors Electronics High Energy Physics - Experiment Instrumentation Instrumentation and Detectors Large Hadron Collider Luminosity Physics Solenoids
Online Access	Get full text
ISSN	1748-0221 1748-0221
DOI	10.1088/1748-0221/12/01/P01020

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Abstract	This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is implemented in hardware, and selects events containing detector signals consistent with an electron, photon, muon, [tau] lepton, jet, or missing transverse energy. A programmable menu of up to 128 object-based algorithms is used to select events for subsequent processing. The trigger thresholds are adjusted to the LHC instantaneous luminosity during data taking in order to restrict the output rate to 100 kHz, the upper limit imposed by the CMS readout electronics. The second level, implemented in software, further refines the purity of the output stream, selecting an average rate of 400 Hz for offline event storage. The objectives, strategy and performance of the trigger system during the LHC Run 1 are described.
AbstractList	This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of potential physics interest from a GHz (MHz) interaction rate of proton-proton (heavy ion) collisions. The first level of the trigger is implemented in hardware, and selects events containing detector signals consistent with an electron, photon, muon, tau lepton, jet, or missing transverse energy. A programmable menu of up to 128 object-based algorithms is used to select events for subsequent processing. The trigger thresholds are adjusted to the LHC instantaneous luminosity during data taking in order to restrict the output rate to 100 kHz, the upper limit imposed by the CMS readout electronics. The second level, implemented in software, further refines the purity of the output stream, selecting an average rate of 400 Hz for offline event storage. The objectives, strategy and performance of the trigger system during the LHC Run 1 are described.
Author	Knünz, V. Spilbeeck, A. Van Python, Q. Rabady, D. Jeitler, M. Lowette, S. Mulders, P. Van Liko, D. Doninck, W. Van Moreels, L. Caillol, C. Bruyn, I. De Luyckx, S. Asilar, E. Hrubec, J. Karapostoli, G. Strauss, J. Matsushita, T. Mossolov, V. Dobur, D. Strom, D. Zeid, S. Abu Krammer, M. Tavernier, S. Barria, P. Randle-conde, A. Zenoni, F. Cimmino, A. Lauwers, J. Favart, L. Blekman, F. Fagot, A. Frühwirth, R. Rahbaran, B. Remortel, N. Van Beernaert, K. Velde, C. Vander König, A. Rohringer, H. Schieck, J. Deroover, K. Perniè, L. Fasanella, G. Seva, T. Cornelis, T. Crucy, S. Reis, T. Klundert, M. Van De Bergauer, T. Heracleous, N. Olbrechts, A. Parijs, I. Van Krätschmer, I. Clerbaux, B. Lentdecker, G. De Garcia, G. Daci, N. Mccartin, J. Lenzi, T. Haevermaet, H. Van Gul, M. Sirunyan, A.M. Mechelen, P. Van Rios, A.A. Ocampo Léonard, A. Benucci, L. Wulz, C.-E. Knutsson, A. Khachatryan, V. Shumeiko, N. Tumasyan, A. Flechl, M. Janssen, X. Alderweireldt, S. Dragicevic, M. Brandstetter, J. Hörmann, N. Brun, H. Yonamine, R. Vanlaer, P. Maerschalk, T. Waltenberger, W. Zhang, F. Er
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CorporateAuthor	Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States) Argonne National Laboratory (ANL), Argonne, IL (United States) Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
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Snippet	This paper describes the CMS trigger system and its performance during Run 1 of the LHC. The trigger system consists of two levels designed to select events of...
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SubjectTerms	Algorithms Computer programs Detectors Electronics High Energy Physics - Experiment Instrumentation Instrumentation and Detectors Large Hadron Collider Luminosity Physics Solenoids
Title	The CMS trigger system
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