Article
A search for an excited muon decaying to a muon and two jets in pp collisions at with the ATLAS detector
New Journal of Physics, IOP Publishing, ISSN 1367-2630
Volume 18, 7, 2016
DOI:10.1088/1367-2630/18/7/073021, Dimensions: pub.1059137570,
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- (1) Center for Particle Physics of Marseilles, grid.470046.1
- (2) University of Oklahoma, grid.266900.b
- (3) Institute of Physics, Academia Sinica, grid.482252.b
- (4) Institute of Physics, grid.435347.2
- (5) Laboratoire de l'Accélérateur Linéaire, grid.462450.1
- (6) National Institute for Subatomic Physics, grid.420012.5
- (7) Michigan State University, grid.17088.36
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- (9) Tel Aviv University, grid.12136.37
- (10) Technion – Israel Institute of Technology, grid.6451.6
- (11) University of Oregon, grid.170202.6
- (12) Stockholm University, grid.10548.38
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- (14) International Centre for Theoretical Physics, grid.419330.c
- (15) INFN Sezione di Trieste, grid.470223.0
- (16) AGH University of Science and Technology, grid.9922.0
- (17) Brookhaven National Laboratory, grid.202665.5
- (18) Northern Illinois University, grid.261128.e
- (19) Ludwig Maximilian University of Munich, grid.5252.0
- (20) Rutherford Appleton Laboratory, grid.76978.37
- (21) University of Liverpool, grid.10025.36
- (22) University of Belgrade, grid.7149.b
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- (24) University of Granada, grid.4489.1
- (25) Laboratory of Instrumentation and Experimental Particles Physics, grid.420929.4
- (26) Boston University, grid.189504.1
- (27) Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
- (28) Joint Institute for Nuclear Research, grid.33762.33
- (29) INFN Sezione di Roma II, grid.470219.9
- (30) University of Rome Tor Vergata, grid.6530.0
- (31) Lund University, grid.4514.4
- (32) P.N. Lebedev Physical Institute of the Russian Academy of Sciences, grid.425806.d
- (33) INFN Sezione di Bologna, grid.470193.8
- (34) University of Bologna, grid.6292.f
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- (40) National Technical University of Athens, grid.4241.3
- (41) INFN Sezione di Milano, grid.470206.7
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- (64) Budker Institute of Nuclear Physics, grid.418495.5
- (65) Novosibirsk State University, grid.4605.7
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- (249) Also at University of Malaya, Department of Physics, Kuala Lumpur, Malaysia
- (250) Nanjing University, grid.41156.37
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Description
A new search signature for excited leptons is explored. Excited muons are sought in the channel , assuming both the production and decay occur via a contact interaction. The analysis is based on 20.3 fb−1 of pp collision data at a centre-of-mass energy of taken with the ATLAS detector at the large hadron collider. No evidence of excited muons is found, and limits are set at the 95% confidence level on the cross section times branching ratio as a function of the excited-muon mass . For between 1.3 and 3.0 TeV, the upper limit on ) is between 0.6 and 1 fb. Limits on are converted to lower bounds on the compositeness scale Λ. In the limiting case , excited muons with a mass below 2.8 TeV are excluded. With the same model assumptions, these limits at larger masses improve upon previous limits from traditional searches based on the gauge-mediated decay .
Funders
- Ministry of Science and Technology of the People's Republic of China
- Chinese Academy of Sciences
- Japan Society for the Promotion of Science
- National Research Council Canada
- Slovenian Research Agency
- Science and Technology Facilities Council
- Ministry of Education, Science and Sport
- Israel Science Foundation
- German Research Foundation
- National Natural Science Foundation of China
- Ministry of Education Youth and Sports
- Leverhulme Trust
- Agence Nationale de la Recherche
- Comisión Nacional de Investigación Científica y Tecnológica
- Agencia Nacional de Promoción Científica y Tecnológica
- French National Centre for Scientific Research
- European Research Council
- Atomic Energy and Alternative Energies Commission
- Government of Catalonia
- Generalitat Valenciana
- São Paulo Research Foundation
- Natural Sciences and Engineering Research Council
- Foundation for Science and Technology
- Alexander von Humboldt Foundation
- Swiss National Science Foundation
- Ministry of Economy, Industry and Competitiveness
- Federal Ministry of Education and Research
- Royal Society
- National Council for Scientific and Technological Development
- Canada Council for the Arts
- Canarie
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