Test of lepton flavour universality in W-boson decays into electrons and τ-leptons using pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector
A bstract A measurement of the ratio of the branching fractions, R τ/e = B ( W → τν ) /B ( W → eν ), is performed using a sample of W bosons originating from top-quark decays to final states containing τ -leptons or electrons. This measurement uses pp collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV, collected by the ATLAS experiment at the Large Hadron Collider during Run 2, corresponding to an integrated luminosity of 140 fb − 1 . The W → τν τ (with τ → eν e ν τ ) and W → eν e decays are distinguished using the differences in the impact parameter distributions and transverse momentum spectra of the electrons. The measured ratio of branching fractions R τ/e = 0 . 975 ± 0 . 012 (stat.) ± 0 . 020 (syst.), is consistent with the Standard Model assumption of lepton flavour universality in W -boson decays.
Publication Details
- Journal
- Apollo (University of Cambridge)
- Published
- 2024-12-17
- Primary Topic
- Geological and Geochemical Analysis
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- Alexander von Humboldt-Stiftung
- Canarie
- Baden-Württemberg Stiftung
- TRIUMF
- CERN
- UK Research and Innovation
- Centres de Recerca de Catalunya
- Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu
- Leverhulme Trust
- Royal Society
- European Commission
- Deutsche Forschungsgemeinschaft
- Agence Nationale de la Recherche
- 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
- Grantová Agentura České Republiky
- Bundesministerium für Bildung und Forschung
- Austrian Science Fund
- Generalitat de Catalunya
- Ministry of Science and Technology of the People's Republic of China
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Generalitat Valenciana
- Bundesministerium für Wissenschaft, Forschung und Wirtschaft
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Max-Planck-Gesellschaft
- Ministerstwo Edukacji i Nauki
- Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- Centre National de la Recherche Scientifique
- Norges Forskningsråd
- Centre National pour la Recherche Scientifique et Technique
- Forskningsrådet om Hälsa, Arbetsliv och Välfärd
- Istituto Nazionale di Fisica Nucleare
- Narodowa Agencja Wymiany Akademickiej
- Agencia Nacional de Investigación y Desarrollo
- National Science and Technology Council
- Horizon 2020 Framework Programme
- Natural Sciences and Engineering Research Council of Canada
- Science and Technology Facilities Council
- Japan Society for the Promotion of Science
- Fundação para a Ciência e a Tecnologia
- Agencia Nacional de Promoción Científica y Tecnológica
- British Columbia Knowledge Development Fund
- European Regional Development Fund
- Agencia Estatal de Investigación
- Institut National de Physique Nucléaire et de Physique des Particules
- European Social Fund
- H2020 European Research Council
- H2020 Marie Skłodowska-Curie Actions