Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at s=13TeV with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The ratio of branching ratios of the W boson to muons and electrons, RWμ/e=B(W→μν)/B(W→eν), has been measured using 140fb-1 of pp collision data at s=13 TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the tt¯ production cross-section in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio RZμμ/ee for the Z boson measured in inclusive Z→ee and Z→μμ events. By using the precise value of RZμμ/ee determined from e+e- colliders, the ratio RWμ/e is determined to be (Formula presented.) The three uncertainties correspond to data statistics, experimental systematics and the external measurement of RZμμ/ee, giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W-boson decays at the 0.5% level.

Original languageEnglish
Article number993
JournalEuropean Physical Journal C
Volume84
Issue number10
DOIs
StatePublished - Oct 2024

Funding

FundersFunder number
BSF-NSF
Australian Research Council
La Caixa Banking Foundation
BMWFW
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
Cooperative Research Centres, Australian Government Department of Industry
National Science Foundation
CEA-DRF
Science and Technology Facilities Council
Horizon 2020, ICSC-NextGenerationEU
H2020 Marie Skłodowska-Curie Actions
INFN-CNAF
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Ciencia e Innovación
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Leverhulme Trust
Baden-Württemberg Stiftung
PROMETEO
Neubauer Family Foundation
Staatssekretariat für Bildung, Forschung und Innovation
The Slovenian Research and Innovation Agency
Generalitat de Catalunya
Instituto Nazionale di Fisica Nucleare
Austrian Science Fund
Agencia Nacional de Investigación y Desarrollo
Bundesministerium für Bildung und Forschung
Helmholtz-Gemeinschaft
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Forskningsrådet om Hälsa, Arbetsliv och Välfärd
Karlsruhe Institute of Technology
Canarie
GridKA
Horizon 2020 Framework Programme
Göran Gustafssons Stiftelser
MIZŠ
European Commission
Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
U.S. Department of Energy
European Cooperation in Science and Technology
EU-ESF
International Council of Shopping Centers
RGC
Fundação de Amparo à Pesquisa do Estado de São Paulo
Institutul de Fizică Atomică
Natural Sciences and Engineering Research Council of Canada
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
GenT Programmes Generalitat Valenciana, Spain
Irish Rugby Football Union
Cantons of Bern and Geneva
Chinese Academy of Sciences
Defence Science Institute
MNE
Agencia Nacional de Promoción Científica y Tecnológica
Royal Society
Minerva Foundation
CERN-CZ
National Research Foundation
Ministerstwo Edukacji i Nauki
Generalitat Valenciana
CERN
National Research Council Canada
Brookhaven National Laboratory
Alexander von Humboldt-Stiftung
Multiple Sclerosis Scientific Research Foundation
Caring Futures Institute, Flinders University
British Columbia Knowledge Development Fund
Ministry of Education, Culture, Sports, Science and Technology
European Research Council101089007, 948254
Ministerstvo Školství, Mládeže a TělovýchovyPRIMUS/21/SCI/017, CZ.02.01.01/00/22_008/0004632
Center for Advancing Research Impact in SocietyJ1-3010
Grantová Agentura České RepublikyGACR-24-11373 S
European Regional Development FundIDIFEDER/2018/048
GenT Programmes Generalitat ValencianaCIDEGENT/2019/023, CIDEGENT/2019/027
MICINPID2021-125273NB, RYC2021-031273-I, RYC2022-038164-I, RYC2020-030254-I, RYC2019-028510-I
Investissements d’Avenir LabexANR-11-LABX-0012
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungRPG-2020-004, SNSF-PCEFP2_194658, NIF-R1-231091
NextGenEUPCI2022-135018-2
Narodowa Agencja Wymiany AkademickiejPPN/PPO/2020/1/00002/U/00001
Japan Society for the Promotion of Science22KK0227, JP21H05085, JP22H04944, JP22H01227
DNSRCIN2P3-CNRS
VetenskapsrådetVR 2018-00482, 2021-03651, VR 2022-04683, VR 2023-03403, VR 2022-03845, 2023-04654
Norges ForskningsrådRCN-314472
MUCCACHIST-ERA-19-XAI-00
DRAC21/SCI/017
Deutsche ForschungsgemeinschaftDFG-469666862, DFG-CR 312/5-2
National Natural Science Foundation of China12275265, NSFC-12175119, NSFC-12075060
Narodowe Centrum NaukiUMO-2022/47/O/ST2/00148, UMO-2020/37/B/ST2/01043, UMO-2019/34/E/ST2/00393, 2022/47/B/ST2/03059, UMO-2021/40/C/ST2/00187, 2021/42/E/ST2/00350, UMO-2023/49/B/ST2/04085
Knut och Alice Wallenbergs StiftelseKAW 2022.0358, KAW 2018.0157, KAW 2018.0458, KAW 2019.0447
Norwegian Financial Mechanism2014-2021
Fondo Nacional de Desarrollo Científico y Tecnológico1230987, 1230812, 1190886, 1210400
North Dakota Game and Fish DepartmentCC-IN2P3
Agence Nationale de la RechercheANR-20-CE31-0013, ANR-21-CE31-0013, ANR-21-CE31-0022

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