Journal
JOURNAL OF INSTRUMENTATION
Volume 15, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1748-0221/15/10/P10017
Keywords
Large detector-systems performance; Trigger algorithms
Categories
Funding
- Austrian Federal Ministry of Education, Science and Research
- Austrian Science Fund
- Belgian Fonds de la Recherche Scientifique
- Fonds voorWetenschappelijk Onderzoek
- Brazilian Funding Agency (CNPq)
- Brazilian Funding Agency (CAPES)
- Brazilian Funding Agency (FAPERJ)
- Brazilian Funding Agency (FAPERGS)
- Brazilian Funding Agency (FAPESP)
- Bulgarian Ministry of Education and Science
- CERN
- Chinese Academy of Sciences of China
- Ministry of Science and Technology of China
- National Natural Science Foundation of China
- Colombian Funding Agency (COLCIENCIAS)
- Croatian Ministry of Science, Education and Sport
- Croatian Science Foundation
- Research and Innovation Foundation, Cyprus
- Secretariat for Higher Education, Science, Technology and Innovation, Ecuador
- Ministry of Education and Research, Estonia
- Estonian Research Council, Estonia [PRG780, PRG803, PRG445]
- European Regional Development Fund, Estonia
- Academy of Finland
- Finnish Ministry of Education and Culture
- Helsinki Institute of Physics
- Institut National de Physique Nucleaire et de Physique des Particules/CNRS, France
- Commissariat a l'Energie Atomique et aux Energies Alternatives/CEA, France
- Bundesministerium fur Bildung und Forschung, Germany
- Deutsche Forschungsgemeinschaft (DFG), Germany [EXC 2121, 390833306]
- Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany
- General Secretariat for Research and Technology, Greece
- National Research, Development and Innovation Fund, Hungary
- Department of Atomic Energy, India
- Department of Science and Technology, India
- Institute for Studies in Theoretical Physics and Mathematics, Iran
- Science Foundation, Ireland
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Science, ICT and Future Planning, Republic of Korea
- National Research Foundation (NRF), Republic of Korea
- Ministry of Education and Science of the Republic of Latvia
- Lithuanian Academy of Sciences
- Ministry of Education (Malaysia)
- University of Malaya (Malaysia)
- Ministry of Science of Montenegro
- Mexican Funding Agency (BUAP)
- Mexican Funding Agency (CINVESTAV)
- Mexican Funding Agency (CONACYT)
- Mexican Funding Agency (LNS)
- Mexican Funding Agency (SEP)
- Mexican Funding Agency (UASLP-FAI)
- Ministry of Business, Innovation and Employment, New Zealand
- Pakistan Atomic Energy Commission
- Ministry of Science and Higher Education, Poland
- National Science Center, Poland
- Fundacao para a Ciencia e a Tecnologia, Portugal
- JINR, Dubna
- Ministry of Education and Science of the Russian Federation
- Federal Agency of Atomic Energy of the Russian Federation
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- National Research Center Kurchatov Institute
- Ministry of Education, Science and Technological Development of Serbia
- Secretaria de Estado de Investigacion, Desarrollo e Innovacion, Spain
- Programa Consolider-Ingenio 2010, Spain
- Plan Estatal de Investigacion Cientifica y Tecnica y de Innovacion 2017-2020 del Principado de Asturias, Spain [IDI-2018-000174]
- Fondo Europeo de Desarrollo Regional, Spain
- Ministry of Science, Technology and Research, Sri Lanka
- Swiss Funding Agency (ETH Board)
- Swiss Funding Agency (ETH Zurich)
- Swiss Funding Agency (PSI)
- Swiss Funding Agency (SNF)
- Swiss Funding Agency (UniZH)
- Swiss Funding Agency (Canton Zurich)
- Swiss Funding Agency (SER)
- Ministry of Science and Technology, Taipei
- Thailand Center of Excellence in Physics
- Institute for the Promotion of Teaching Science and Technology of Thailand
- Special Task Force for Activating Research
- National Science and Technology Development Agency of Thailand
- Scientific and Technical Research Council of Turkey
- Turkish Atomic Energy Authority
- National Academy of Sciences of Ukraine
- Science and Technology Facilities Council, U.K.
- U.S. Department of Energy
- U.S. National Science Foundation
- Marie-Curie program (European Union)
- European Research Council (European Union) [675440, 752730, 765710]
- Horizon 2020 (European Union) [675440, 752730, 765710]
- Leventis Foundation
- A.P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office
- Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- F.R.S.-FNRS (Belgium) under the Excellence of ScienceEOS-be.h project [30820817]
- FWO (Belgium) under the Excellence of ScienceEOS-be.h project [30820817]
- Beijing Municipal Science AMP
- Technology Commission [Z191100007219010]
- Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
- Lendulet (Momentum) Program of the Hungarian Academy of Sciences
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- New National Excellence Program UNKP
- NKFIA (Hungary) [123842, 123959, 124845, 124850, 125105, 128713, 128786, 129058]
- Council of Scientific and Industrial Research, India
- HOMING PLUS program of the Foundation for Polish Science
- European Union, Regional Development Fund
- Mobility Plus program of the Ministry of Science and Higher Education
- National Science Center (Poland) [Harmonia 2014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, 2015/19/B/ST2/02861, Sonata-bis 2012/07/E/ST2/01406]
- National Priorities Research Program by Qatar National Research Fund
- Ministry of Science and Higher Education (Russia) [02.a03.21.0005]
- Tomsk PolytechnicUniversity Competitiveness Enhancement Program (Russia)
- Nauka Project (Russia) [FSWW-2020-0008]
- Programa de Excelencia Maria de Maeztu
- Programa Severo Ochoa del Principado de Asturias
- Thalis program - EU-ESF
- Aristeia program - EU-ESF
- Greek NSRF
- Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand)
- Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
- Kavli Foundation
- Nvidia Corporation
- SuperMicro Corporation
- Welch Foundation [C-1845]
- Weston Havens Foundation (U.S.A.)
- STFC [ST/K001639/1, ST/H000925/2, ST/N001273/1, ST/S000739/1, ST/L005603/1, ST/M004775/1, ST/K003542/1, ST/S00078X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M004775/1, ST/L005603/1, ST/K003542/1, ST/H000925/2, ST/K001639/1, ST/N001273/1] Funding Source: researchfish
Ask authors/readers for more resources
At the start of Run 2 in 2015, the LHC delivered proton-proton collisions at a center-ofmass energy of 13 TeV. During Run 2 (years 2015-2018) the LHC eventually reached a luminosity of 2.1 x 10(34) cm(-2) s(-1), almost three times that reached during Run 1 (2009-2013) and a factor of two larger than the LHC design value, leading to events with up to a mean of about 50 simultaneous inelastic proton-proton collisions per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior to 2016 to improve the selection of physics events in the challenging conditions posed by the second run of the LHC. This paper describes the performance of the CMS Level-1 trigger upgrade during the data taking period of 2016-2018. The upgraded trigger implements pattern recognition and boosted decision tree regression techniques for muon reconstruction, includes pileup subtraction for jets and energy sums, and incorporates pileup-dependent isolation requirements for electrons and tau leptons. In addition, the new trigger calculates high-level quantities such as the invariant mass of pairs of reconstructed particles. The upgrade reduces the trigger rate from background processes and improves the trigger efficiency for a wide variety of physics signals.
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