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Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √s = 8 TeV

Khachatryan, V. and Apresyan, A. and Bornheim, A. and Bunn, J. and Chen, Y. and Duarte, J. and Mott, A. and Newman, H. B. and Pena, C. and Pierini, M. and Spiropulu, M. and Vlimant, J. R. and Wilkinson, R. and Xie, S. and Zhu, R. Y. and Dubinin, M. (2015) Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √s = 8 TeV. Journal of Instrumentation, 2015 (10). Art. No. P06005. ISSN 1748-0221. http://resolver.caltech.edu/CaltechAUTHORS:20150817-111241526

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Abstract

The performance and strategies used in electron reconstruction and selection at CMS are presented based on data corresponding to an integrated luminosity of 19.7 fb^(−1), collected in proton-proton collisions at √s = 8 TeV at the CERN LHC. The paper focuses on prompt isolated electrons with transverse momenta ranging from about 5 to a few 100 GeV. A detailed description is given of the algorithms used to cluster energy in the electromagnetic calorimeter and to reconstruct electron trajectories in the tracker. The electron momentum is estimated by combining the energy measurement in the calorimeter with the momentum measurement in the tracker. Benchmark selection criteria are presented, and their performances assessed using Z, Y, and J/ψ decays into e+ + e− pairs. The spectra of the observables relevant to electron reconstruction and selection as well as their global efficiencies are well reproduced by Monte Carlo simulations. The momentum scale is calibrated with an uncertainty smaller than 0.3%. The momentum resolution for electrons produced in Z boson decays ranges from 1.7 to 4.5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/1748-0221/10/06/P06005DOIArticle
http://iopscience.iop.org/1748-0221/10/06/P06005/PublisherArticle
http://arxiv.org/abs/1502.02701arXivDiscussion Paper
Additional Information:© 2015 CERN for the benefit of the CMS collaboration, published under the terms of the Creative Commons Attribution 3.0 License by IOP Publishing Ltd and Sissa Medialab srl. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI. Received: February 9, 2015; Accepted: April 14, 2015; Published: June 10, 2015. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: the Austrian Federal Ministry of Science, Research and Economy and the Austrian Science Fund; the Belgian Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese Academy of Sciences, Ministry of Science and Technology, and National Natural Science Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport, and the Croatian Science Foundation; the Research Promotion Foundation, Cyprus; the Ministry of Education and Research, Estonian Research Council via IUT23-4 and IUT23-6 and European Regional Development Fund, Estonia; the Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut National de Physique Nucléaire et de Physique des Particules/CNRS, and Commissariat à l’ Énergie Atomique et aux Énergies Alternatives/CEA, France; the Bundesministerium für Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the National Scientific Research Foundation, and National Innovation Office, Hungary; the Department of Atomic Energy and the Department of Science and Technology, India; the Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di Fisica Nucleare, Italy; the Ministry of Science, ICT and Future Planning, and National Research Foundation (NRF), Republic of Korea; the Lithuanian Academy of Sciences; the Ministry of Education, and University of Malaya (Malaysia); the Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and UASLP-FAI); the Ministry of Business, Innovation and Employment, New Zealand; the Pakistan Atomic Energy Commission; the Ministry of Science and Higher Education and the National Science Centre, Poland; the Fundação para a Cîencia e a Tecnologia, Portugal; JINR, Dubna; the Ministry of Education and Science of the Russian Federation, the Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, and the Russian Foundation for Basic Research; the Ministry of Education, Science and Technological Development of Serbia; the Secretaría de Estado de Investigación, Desarrollo e Innovación and Programa Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER); the Ministry of Science and Technology, Taipei; the Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand; the Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the National Academy of Sciences of Ukraine, and State Fund for Fundamental Researches, Ukraine; the Science and Technology Facilities Council, U.K.; the US Department of Energy, and the US National Science Foundation. Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fund.
Group:CMS@Caltech
Funders:
Funding AgencyGrant Number
Austrian Federal Ministry of Science, Research and EconomyUNSPECIFIED
Austrian Science FundUNSPECIFIED
Belgian Fonds de la Recherche ScientifiqueUNSPECIFIED
Fonds Voor Wetenschappelijk Onderzoek (FWO) (Belgium)UNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNSPECIFIED
Bulgarian Ministry of Education and ScienceUNSPECIFIED
CERN (China)UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
Ministry of Science and Technology (China)UNSPECIFIED
National Natural Science Foundation of ChinaUNSPECIFIED
Colombian Funding Agency (COLCIENCIAS)UNSPECIFIED
Croatian Ministry of Science, Education and SportUNSPECIFIED
Croatian Science FoundationUNSPECIFIED
Research Promotion Foundation (Cyprus) UNSPECIFIED
Ministry of Education and Research, Estonian Research CouncilIUT23-4
Ministry of Education and Research, Estonian Research CouncilIUT23-6
European Regional Development FundUNSPECIFIED
Academy of FinlandUNSPECIFIED
Finnish Ministry of Education and CultureUNSPECIFIED
Helsinki Institute of PhysicsUNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules/CNRSUNSPECIFIED
Commissariat à l’ Énergie Atomique et aux Énergies Alternatives/CEAUNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Helmholtz-Gemeinschaft Deutscher ForschungszentrenUNSPECIFIED
General Secretariat for Research and Technology (Greece)UNSPECIFIED
National Scientific Research Foundation (Hungary)UNSPECIFIED
National Innovation Office (Hungary)UNSPECIFIED
Department of Atomic Energy (India)UNSPECIFIED
Department of Science and Technology (India)UNSPECIFIED
Institute for Studies in Theoretical Physics and Mathematics (Iran)UNSPECIFIED
Science Foundation, IrelandUNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Ministry of Science, ICT and Future Planning (Korea)UNSPECIFIED
National Research Foundation (NRF) (Korea)UNSPECIFIED
Lithuanian Academy of SciencesUNSPECIFIED
Ministry of Education (Malaysia)UNSPECIFIED
University of Malaya (Malaysia)UNSPECIFIED
CINVESTAV (Mexico)UNSPECIFIED
CONACyT (Mexico)UNSPECIFIED
SEP (Mexico)UNSPECIFIED
UASLP-FAI (Mexico)UNSPECIFIED
Ministry of Business, Innovation and Employment (New Zealand)UNSPECIFIED
Pakistan Atomic Energy CommissionUNSPECIFIED
Ministry of Science and Higher Education (Poland)UNSPECIFIED
National Science Centre (Poland)UNSPECIFIED
Fundação para a Cîencia e a Tecnologia (FCT)UNSPECIFIED
JINR (Dubna)UNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
Federal Agency of Atomic Energy of the Russian FederationUNSPECIFIED
Russian Academy of SciencesUNSPECIFIED
Russian Foundation for Basic ResearchUNSPECIFIED
Ministry of Education, Science and Technological Development (Serbia)UNSPECIFIED
Secretaría de Estado de Investigación (Spain)UNSPECIFIED
Desarrollo e Innovación and Programa Consolider-Ingenio 2010 (Spain)UNSPECIFIED
ETH Board UNSPECIFIED
ETH ZurichUNSPECIFIED
PSI (Switzerland)UNSPECIFIED
SNF (Switzerland)UNSPECIFIED
UniZH (Switzerland) UNSPECIFIED
Canton Zurich (Switzerland) UNSPECIFIED
SER (Switzerland)UNSPECIFIED
Ministry of Science and Technology (Taipei)UNSPECIFIED
Thailand Center of Excellence in PhysicsUNSPECIFIED
Institute for the Promotion of Teaching Science and Technology (Thailand)UNSPECIFIED
Special Task Force for Activating Research (Thailand)UNSPECIFIED
National Science and Technology Development Agency (Thailand)UNSPECIFIED
Scientific and Technical Research Council (Turkey)UNSPECIFIED
Turkish Atomic Energy AuthorityUNSPECIFIED
National Academy of Sciences (Ukraine)UNSPECIFIED
State Fund for Fundamental Researches (Ukraine)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
European Research Council (ERC)UNSPECIFIED
EPLANET (European Union)UNSPECIFIED
Leventis FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Belgian Federal Science Policy OfficeUNSPECIFIED
Fonds pour la Formation à la Recherche dans l’índustrie et dans l’Ágriculture (FRIA-Belgium)UNSPECIFIED
Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)UNSPECIFIED
Ministry of Education, Youth and Sports (MEYS) of Czech RepublicUNSPECIFIED
Council of Science and Industrial Research (India)UNSPECIFIED
Foundation for Polish Science HOMING PLUS programmeUNSPECIFIED
European Union Regional Development FundUNSPECIFIED
Compagnia di San Paolo (Torino)UNSPECIFIED
Consorzio per la Fisica (Trieste)UNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)20108T4XTM
Thalis programmeUNSPECIFIED
Aristeia programmeUNSPECIFIED
Greek NSRFUNSPECIFIED
Qatar National Research Fund National Priorities Research ProgramUNSPECIFIED
SCOAP3UNSPECIFIED
Subject Keywords:Pattern recognition, cluster finding, calibration and fitting methods; Performance of High Energy Physics Detectors
Record Number:CaltechAUTHORS:20150817-111241526
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150817-111241526
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59580
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Aug 2015 19:59
Last Modified:17 Aug 2015 19:59

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