The CMS trigger system
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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, τ 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.
- Research Organization:
- ABC Federal U.; Aachen, Tech. Hochsch.; Adiyaman U.; Alabama U.; Andes U., Bogota; Antwerp U.; Argonne National Laboratory (ANL), Argonne, IL (United States); Athens U.; Auckland U.; Bari Polytechnic; Bari U.; Basilicata U., Potenza; Baylor U.; Beijing, Inst. High Energy Phys.; Belgrade U.; Beni-Suef U.; Bhabha Atomic Res. Ctr.; Bhubaneswar, NISER; Bogazici U.; Bologna U.; Boskovic Inst., Zagreb; Boston U.; Brandenburg Tech. U.; Bristol U.; British U. in Egypt; Brown U.; Brunel U.; Brussels U.; Budapest, RMKI; CC, Villeurbanne; CERN; CHEP, Taegu; CINVESTAV, IPN; Cag U., Mersin; Cairo U.; Cairo, Acad. Sci. Res. Tech.; Caltech; Cantabria Inst. of Phys.; Canterbury U.; Carnegie Mellon U.; Catania U.; Charles U.; Chonbuk Natl. U.; Chonnam Natl. U.; Chulalongkorn U.; Colorado U.; Conacyt, Mexico; Cornell U.; Cukurova U.; Cyprus U.; DESY; Debrecen, Inst. Nucl. Res.; Delhi U.; Democritos Nucl. Res. Ctr.; Dubna, JINR; Ecole Polytechnique; Eotvos U.; Erzincan U.; Facolta di Ingegneria, Rome; Fayoum U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Florence U.; Florida Inst. Tech.; Florida Intl. U.; Florida State U.; Florida U.; Frascati; GTU, Tbilisi; Gaziosmanpasa U.; Genoa U.; Gent U.; Guglielmo Marconi U.; Hacettepe U.; Hamburg U.; Hanyang U.; Haute Alsace U.; Helsinki Inst. of Phys.; Helsinki U.; IAC, La Laguna; IISER, Bhopal; IISER, Pune; IIUM, Kuala Lumpur; INFN, Bari; INFN, Bologna; INFN, Catania; INFN, Florence; INFN, Genoa; INFN, Milan Bicocca; INFN, Naples; INFN, Padua; INFN, Pavia; INFN, Perugia; INFN, Pisa; INFN, Rome; INFN, Trieste; INFN, Turin; IPM, Tehran; IRFU, Saclay; Iberoamericana U.; Illinois U., Chicago; Imperial Coll., London; Inst. Scintill. Mat., Kharkiv; Ioannina U.; Iowa U.; Isfahan Tech. U.; Islamic Azad U., Sci. Res. Branch, Tehran; Istanbul Bilgi U.; Istanbul, Tech. U.; Izmir Inst. Tech.; Jeddah U.; Johns Hopkins U.; KIT, Karlsruhe, EKP; Kafkas U.; Kangweon Natl. U.; Kansas State U.; Kansas U.; Kharkov, KIPT; Korea U.; LIP, Lisbon; Lappeenranta U. Tech.; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lebedev Inst.; Louvain U.; Lyon, IPN; MIT; MOSTI, Malaysian Nucl. Agency, Kajang; Madrid, Autonoma U.; Madrid, CIEMAT; Malaya U.; Marmara U.; Maryland U.; Mersin U.; Middle East Tech. U., Ankara; Milan Bicocca U.; Mimar Sinan U.; Minnesota U.; Minsk, High Energy Phys. Ctr.; Mississippi U.; Moscow Phys. Eng. Inst.; Moscow State U.; Moscow, INR; Moscow, ITEP; NCBJ, Swierk; NICPB, Tallinn; Naples U.; Natl. Tech. U., Athens; Nebraska U.; Northeastern U.; Northwestern U.; Notre Dame U.; Ohio State U.; Oviedo U.; Ozyegin U.; PSI, Villigen; Padua U.; Panjab U.; Paris, IN2P3; Pavia U.; Peking U.; Perugia U.; Piemonte Orientale U., Novara; Piri Reis U., Istanbul; Pisa U.; Pisa, Scuola Normale Superiore; Princeton U.; Puebla U., Inst. Fis.; Puerto Rico U., Mayaguez; Purdue U.; Purdue U., Calumet; Quaid-i-Azam U.; Rice U.; Rio de Janeiro State U.; Rio de Janeiro, CBPF; Rochester U.; Rome U.; Ruhuna U.; Rutgers U., Piscataway; Rutherford; SUNY, Buffalo; Saha Inst.; San Luis Potosi U.; Sao Paulo, IFT; Seoul Natl. U.; Seoul U.; Serpukhov, IHEP; Siena U.; Sofiya U.; Sofiya, Inst. Nucl. Res.; Southampton U.; Split Tech. U.; Split U.; St. Petersburg Polytechnic Inst.; St. Petersburg, INP; Strasbourg, IPHC; Suez Canal U.; Sungkyunkwan U.; TU Vienna; Taiwan, Natl. Central U.; Taiwan, Natl. Taiwan U.; Tata Inst.; Tbilisi State U.; Tennessee U.; Texas A&M U. Qatar, Doha; Texas A-M; Texas Tech.; Trieste U.; Turin U.; U. Bern, AEC; U. Campinas; U. Debrecen, Inst. Phys.; U. Mons; U. Tehran, Coll. Engin.; UC, Davis; UC, Riverside; UC, San Diego; UC, Santa Barbara; UCLA; University Coll., Dublin; Utah Valley U.; VINCA Inst. Nucl. Sci., Belgrade; Vanderbilt U.; Vienna, OAW; Vilnius U.; Virginia U.; Visva Bharati U.; Vrije U., Brussels; Warsaw U.; Warsaw U. of Tech.; Wayne State U.; Wisconsin U., Madison; Yerevan Phys. Inst.; Yildiz Tech. U.; Zurich U.; Zurich, ETH
- Sponsoring Organization:
- US Department of Energy
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1329706
- Alternate ID(s):
- OSTI ID: 22673822
- Report Number(s):
- CERN-EP-2016-160; CMS-TRG-12-001; FERMILAB-PUB-16-377-CMS; oai:inspirehep.net:1485699; arXiv:1609.02366
- Journal Information:
- JINST, Journal Name: JINST Journal Issue: 01 Vol. 12
- Country of Publication:
- United States
- Language:
- English
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