Search for displaced vertices of oppositely charged leptons from decays of long-lived particles in pp collisions at s=13 TeV with the ATLAS detector

The ATLAS collaboration

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Abstract

A search for long-lived particles decaying into an oppositely charged lepton pair, μμ, ee, or eμ, is presented using 32.8fb−1 of pp collision data collected at s=13 TeV by the ATLAS detector at the LHC. Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced from the primary pp interaction region. No lepton pairs with an invariant mass greater than 12 GeV are observed, consistent with the background expectations derived from data. The detection efficiencies for generic resonances with lifetimes (cτ) of 100–1000 mm decaying into a dilepton pair with masses between 0.1–1.0 TeV are presented as a function of pT and decay radius of the resonances to allow the extraction of upper limits on the cross sections for theoretical models. The result is also interpreted in a supersymmetric model in which the lightest neutralino, produced via squark–antisquark production, decays into ℓ+′−ν (ℓ,ℓ=e, μ) with a finite lifetime due to the presence of R-parity violating couplings. Cross-section limits are presented for specific squark and neutralino masses. For a 700 GeV squark, neutralinos with masses of 50–500 GeV and mean proper lifetimes corresponding to cτ values between 1 mm to 6 m are excluded. For a 1.6 TeV squark, cτ values between 3 mm to 1 m are excluded for 1.3 TeV neutralinos.

Original languageEnglish
Article number135114
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume801
DOIs
StatePublished - 10 Feb 2020

Funding

FundersFunder number
Not addedST/N000307/1, ST/N000331/1, 1852475
AvH Foundation
BSF-NSF
Benoziyo Center, Israel
CEA-DRF
CEA-DRF/IRFU
Cantons of Bern and Geneva
Czech Republic
DNSRCIN2P3-CNRS
DST/NRF
EU-ESF
Generalitat de Catalunya , Spain
Horizon 2020 , and Marie Skłodowska-Curie Actions
Horizon 2020, and Marie Sk?odowska
INFN-CNAF
IRFU
KIT/GridKA
MES of Russia
MESTD
MIZŠ
MNE
MNE/IFA
MSMT
MSSR
NDGFCC-IN2P3
RGC
VSC CR
Wallenberg Foundation
National Science Foundation
U.S. Department of Energy
Alexander von Humboldt-Stiftung
Alabama Space Grant Consortium
Brookhaven National Laboratory
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
Arizona-Nevada Academy of Science
Multiple Sclerosis Scientific Research Foundation
CERN
Iowa Science Foundation
Glycemic Index Foundation
Azərbaycan Milli Elmlər Akademiyası
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Canada Foundation for Innovation
Science and Technology Facilities CouncilST/L006162/1, GRIDPP
Science and Technology Facilities Council
Leverhulme Trust
Royal Society
European Research Council
European Cooperation in Science and Technology
Australian Research Council
National Stroke Foundation
Neurosurgical Research Foundation
Department of Science and Technology, Ministry of Science and Technology, India
Singapore Eye Research Institute
Helmholtz-Gemeinschaft
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Danmarks Grundforskningsfond
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Natural Science Foundation of China
Ministerstvo Školství, Mládeže a Tělovýchovy
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Austrian Science Fund
Comisión Nacional de Investigación Científica y Tecnológica
Agencia Nacional de Promoción Científica y Tecnológica
Ministerstvo Zdravotnictví Ceské Republiky
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Economía y Competitividad
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
General Secretariat for Research and Technology
Conselho Nacional de Desenvolvimento Científico e Tecnológico
National Rehabilitation Center
Ministry of Science and Technology
Joint Institute for Nuclear Research
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Javna Agencija za Raziskovalno Dejavnost RS
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
Ministerstwo Edukacji i Nauki
Ministry of Science and Technology, Taiwan
Centre National pour la Recherche Scientifique et Technique
Bundesministerium für Bildung und Frauen
Staatssekretariat für Bildung, Forschung und Innovation
British Columbia Knowledge Development Fund
European Regional Development Fund
Institut Nacional d'Educacio Fisica de Catalunya, Generalitat de Catalunya
Council on grants of the President of the Russian Federation
Marianne and Marcus Wallenberg Foundation
Istituto Nazionale di Fisica Nucleare
National Research Center "Kurchatov Institute"
Institutul de Fizică Atomică
Royal Society of South Australia

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