ATLAS Collaboration (Including: Farrington, Sinead, Harrison, P. F., Janus, M., Jeske, C., Jones, G. (Graham), Martin, T. A. and Pianori, E.). (2013) Search for excited electrons and muons in √s= 8 TeV proton–proton collisions with the ATLAS detector. New Journal of Physics, Volume 15 . Article number 093011 . doi:10.1088/1367-2630/15/9/093011 ISSN 1367-2630.

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Abstract

The ATLAS detector at the Large Hadron Collider is used to search for excited electrons and excited muons in the channel pp → ℓℓ* → ℓℓγ, assuming that excited leptons are produced via contact interactions. The analysis is based on 13 fb−1 of pp collisions at a centre-of-mass energy of 8 TeV. No evidence for excited leptons is found, and a limit is set at the 95% credibility level on the cross section times branching ratio as a function of the excited-lepton mass mℓ*. For mℓ* ≥ 0.8 TeV, the respective upper limits on σB(ℓ* → ℓγ) are 0.75 and 0.90 fb for the e* and μ* searches. Limits on σB are converted into lower bounds on the compositeness scale Λ. In the special case where Λ = mℓ*, excited-electron and excited-muon masses below 2.2 TeV are excluded.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Electronic excitation, Muons, Proton-proton interactions, Large Hadron Collider (France and Switzerland)
Journal or Publication Title:	New Journal of Physics
Publisher:	IOP Publishing
ISSN:	1367-2630
Official Date:	6 September 2013
Dates:	Date Event 6 September 2013 Published
Volume:	Volume 15
Article Number:	Article number 093011
DOI:	10.1088/1367-2630/15/9/093011
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	26 December 2015
Date of first compliant Open Access:	26 December 2015
Funder:	Obʺedinennyĭ institut i︠a︡dernykh issledovaniĭ (Dubna, Chekhovskiĭ raĭon, Russia), Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Yerevan Physics Institute (Armenia), Australian Research Council (ARC), Austria. Bundesministerium für Wissenschaft und Forschung, Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) (FWF), Azärbaycan Milli Elmlär Akademiyası, Sosny Science and Technology Center (Belarus), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Natural Sciences and Engineering Research Council of Canada (NSERC), National Research Council Canada (NRCC), Canada Foundation for Innovation (CFI), European Organization for Nuclear Research (CERN), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Zhongguo ke xue yuan [Chinese Academy of Sciences] (CAS), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology], Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Fondo Colombiano de Investigaciones Científicas y Proyectos Especiales Francisco José de Caldas (COLCIENCIAS), Czech Socialist Republic (Czechoslovakia). Ministerstvo školství, mládeže a tělovýchovy, Czech Socialist Republic (Czechoslovakia). Ministerstvo průmyslu a obchodu, VSC CR (Czech Republic), Danmarks Grundforskningsfond [Danish National Research Foundation], Statens naturvidenskabelige forskningsråd (Denmark) [Natural Science Research Council], European Particle physics Latin American NETwork (EPLANET), European Research Council (ERC), Lundbeck Foundation, European Union (EU), Centre national de la recherche scientifique (France) (CNRS), Direction des Sciences de la Matière, Sakʻartʻvelos mecʻnierebatʻa erovnuli akademia [Georgian National Academy of Sciences] (GNAS), Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Alexander von Humboldt-Stiftung (AvHS), Greece. General Secretariat of Research and Technology, Israel Science Foundation (ISF), Minerva Stiftung, German-Israeli Foundation for Scientific Research and Development, Deutsch-Israelische Projektkooperation, Benoziyo Center (Israel), Istituto nazionale di fisica nucleare (INFN), Japan. Monbushō, Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Science] (NGS), Centre national pour la recherche scientifique et technique (Morocco), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Norges forskningsråd [Norwegian Research Council], Poland. Ministerstwo Nauki i Szkolnictwa Wyższego [Ministry of Science and Higher Education] (MNiSW), Gabinete dos Relações Internationais da Ciência e Ensino Superior (Portugal), Fundação para a Ciência e a Tecnologia (FCT), Romania. Ministerul Educației, Cercetării și Tineretului [Ministry of Education, Research, Youth and Sports], Russia (Federation). Ministerstvo obrazovaniia i nauki [Ministry of Education and Science], Federalʹnoe agentstvo po atomnoĭ ėnergii (Russia), Serbia. Joint Institute for Nuclear Research (JINR), Serbia. Ministarstvo za nauku i tehnologiju i razvoj, Slovakia. Ministerstvo školstva, Slovenian Research Agency, Slovenia. Ministrstvo za visoko šolstvo, znanost in tehnologijo, South Africa. Dept. of Science and Technology, Spain. Ministerio de Ciencia e Innovación (MICINN), Sweden. Vetenskapsrådet [Research Council], Knut och Alice Wallenbergs Stiftelse (Sweden), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Bern (Switzerland : Canton), Guo jia ke xue wei yuan hui [National Science Council (Taiwan)], Türkiye Atom Enerjisi Kurumu (TAEK), Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (Great Britain), Leverhulme Trust (LT), United States. Dept. of Energy, National Science Foundation (U.S.) (NSF), Institut national de physique nucléaire et de physique des particules, France. Commissariat à l'énergie atomique (CEA), National Research Foundation (South Africa), Geneva (Switzerland : Canton)

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