A search for an unexpected asymmetry in the production of e+μ and eμ+ pairs in proton–proton collisions recorded by the ATLAS detector at s=13 TeV

The ATLAS collaboration

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3 Scopus citations

Abstract

This search, a type not previously performed at ATLAS, uses a comparison of the production cross sections for e+μ and eμ+ pairs to constrain physics processes beyond the Standard Model. It uses 139fb−1 of proton–proton collision data recorded at s=13 TeV at the LHC. Targeting sources of new physics which prefer final states containing e+μ to eμ+, the search contains two broad signal regions which are used to provide model-independent constraints on the ratio of cross sections at the 2% level. The search also has two special selections targeting supersymmetric models and leptoquark signatures. Observations using one of these selections are able to exclude, at 95% confidence level, singly produced smuons with masses up to 640 GeV in a model in which the only other light sparticle is a neutralino when the R-parity-violating coupling λ231 is close to unity. Observations using the other selection exclude scalar leptoquarks with masses below 1880 GeV when g1R eu=g1R μc=1, at 95% confidence level. The limit on the coupling reduces to g1R eu=g1R μc=0.46 for a mass of 1420 GeV.

Original languageEnglish
Article number137106
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume830
DOIs
StatePublished - 10 Jul 2022

Funding

FundersFunder number
CEA-DRF
Canton of Bern and Canton of Geneva
DNSRCIN2P3-CNRS
EU-ESF
GIF , Israel
GIF, Israel
GenT Programmes Generalitat Valenciana , Spain
GenT Programmes Generalitat Valenciana, Spain
GridKA
INFN-CNAF
IRFU
La Caixa Banking Foundation
MES of Russia
MIZŠ
NDGFCC-IN2P3
Norwegian Financial Mechanism2014-2021
PROMETEO
RGC
Wallenberg Foundation
National Science Foundation
U.S. Department of Energy
Alexander von Humboldt-Stiftung
Alabama Space Grant Consortium
Brookhaven National Laboratory
Karlsruhe Institute of Technology
Duchenne Research Fund
H2020 Marie Skłodowska-Curie Actions
Multiple Sclerosis Scientific Research Foundation
CERN
Göran Gustafssons Stiftelser
Azərbaycan Milli Elmlər Akademiyası
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Canada Foundation for Innovation
Science and Technology Facilities Council
Leverhulme Trust
European Commission
European Research Council
European Cooperation in Science and Technology
Australian Research Council
National Stroke Foundation
Neurosurgical Research Foundation
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
United States-Israel Binational Science Foundation
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
Generalitat de Catalunya
Ministry of Science and Technology of the People's Republic of China
Agencia Nacional de Promoción Científica y Tecnológica
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Conselho Nacional de Desenvolvimento Científico e Tecnológico
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
Centre National de la Recherche Scientifique
Ministerio de Ciencia e Innovación
European Social Fund
Centre National pour la Recherche Scientifique et Technique
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Staatssekretariat für Bildung, Forschung und Innovation
Horizon 2020
British Columbia Knowledge Development Fund
European Regional Development Fund
Defence Science Institute
Council on grants of the President of the Russian Federation
Institut National de Physique Nucléaire et de Physique des Particules
National Research Center "Kurchatov Institute"
Narodowa Agencja Wymiany Akademickiej
Institutul de Fizică Atomică
Agencia Nacional de Investigación y Desarrollo
Royal Society of South Australia

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