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Article: Test of lepton flavour universality in W-boson decays into electrons and τ-leptons using pp collisions at √s=13 TeV with the ATLAS detector

TitleTest of lepton flavour universality in W-boson decays into electrons and <i>τ</i>-leptons using pp collisions at √s=13 TeV with the ATLAS detector
Authors
The ATLAS collaborationAad, GAakvaag, EAbbott, BAbdelhameed, SAbeling, KAbicht, N JAbidi, S HAboelela, MAboulhorma, AAbramowicz, HAbulaiti, YAcharya, B SAckermann, ABourdarios, C AdamAdamczyk, LAddepalli, S VAddison, M JAdelman, JAdiguzel, AAdye, TAffolder, A AAfik, YAddepalli, M N AgarasS VAddison, M JAdelman, JAdiguzel, AAdye, TAffolder, A AAfik, YAgaras, M NPizzimento, LucaFAN, Ka YanJIANG, QiminParedes Hernandez, DKTam, Kai ChungTu, Yanjun
KeywordsFlavour Physics
Hadron-Hadron Scattering
Tau Physics
Issue Date6-May-2025
PublisherSpringer
Citation
Journal of High Energy Physics, 2025, v. 2025, n. 5, p. 1-48 How to Cite?
DOI: http://dx.doi.org/10.1007/JHEP05(2025)038
Abstract

A measurement of the ratio of the branching fractions, Rτ/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  = 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 → τντ (with τ → eνeντ) and W → eνe decays are distinguished using the differences in the impact parameter distributions and transverse momentum spectra of the electrons. The measured ratio of branching fractions Rτ/e = 0.975 ± 0.012 (stat.) ± 0.020 (syst.), is consistent with the Standard Model assumption of lepton flavour universality in W-boson decays.


Persistent Identifierhttp://hdl.handle.net/10722/369156
ISSN
1126-6708
2012 Impact Factor: 5.618
ISI Accession Number ID
WOS:001498829900001

 

DC FieldValueLanguage
dc.contributor.authorThe ATLAS collaboration-
dc.contributor.authorAad, G-
dc.contributor.authorAakvaag, E-
dc.contributor.authorAbbott, B-
dc.contributor.authorAbdelhameed, S-
dc.contributor.authorAbeling, K-
dc.contributor.authorAbicht, N J-
dc.contributor.authorAbidi, S H-
dc.contributor.authorAboelela, M-
dc.contributor.authorAboulhorma, A-
dc.contributor.authorAbramowicz, H-
dc.contributor.authorAbulaiti, Y-
dc.contributor.authorAcharya, B S-
dc.contributor.authorAckermann, A-
dc.contributor.authorBourdarios, C Adam-
dc.contributor.authorAdamczyk, L-
dc.contributor.authorAddepalli, S V-
dc.contributor.authorAddison, M J-
dc.contributor.authorAdelman, J-
dc.contributor.authorAdiguzel, A-
dc.contributor.authorAdye, T-
dc.contributor.authorAffolder, A A-
dc.contributor.authorAfik, Y-
dc.contributor.authorAddepalli, M N AgarasS V-
dc.contributor.authorAddison, M J-
dc.contributor.authorAdelman, J-
dc.contributor.authorAdiguzel, A-
dc.contributor.authorAdye, T-
dc.contributor.authorAffolder, A A-
dc.contributor.authorAfik, Y-
dc.contributor.authorAgaras, M N-
dc.contributor.authorPizzimento, Luca-
dc.contributor.authorFAN, Ka Yan-
dc.contributor.authorJIANG, Qimin-
dc.contributor.authorParedes Hernandez, DK-
dc.contributor.authorTam, Kai Chung-
dc.contributor.authorTu, Yanjun-
dc.date.accessioned2026-01-20T08:35:15Z-
dc.date.available2026-01-20T08:35:15Z-
dc.date.issued2025-05-06-
dc.identifier.citationJournal of High Energy Physics, 2025, v. 2025, n. 5, p. 1-48-
dc.identifier.issn1126-6708-
dc.identifier.urihttp://hdl.handle.net/10722/369156-
dc.description.abstract<p>A measurement of the ratio of the branching fractions, <em>R</em><sub><em>τ/e</em></sub> = <em>B</em>(<em>W</em> → <em>τν</em>)<em>/B</em>(<em>W</em> → <em>eν</em>), is performed using a sample of <em>W</em> bosons originating from top-quark decays to final states containing <em>τ</em>-leptons or electrons. This measurement uses <em>pp</em> collisions at  = 13 TeV, collected by the ATLAS experiment at the Large Hadron Collider during Run 2, corresponding to an integrated luminosity of 140 fb<sup><em>−</em>1</sup>. The <em>W → τν</em><sub><em>τ</em></sub> (with <em>τ → eν</em><sub><em>e</em></sub><em>ν</em><sub><em>τ</em></sub>) and <em>W → eν</em><sub><em>e</em></sub> decays are distinguished using the differences in the impact parameter distributions and transverse momentum spectra of the electrons. The measured ratio of branching fractions <em>R</em><sub><em>τ/e</em></sub> = 0<em>.</em>975 ± 0<em>.</em>012 (stat.) ± 0<em>.</em>020 (syst.), is consistent with the Standard Model assumption of lepton flavour universality in <em>W</em>-boson decays.<br></p>-
dc.languageeng-
dc.publisherSpringer-
dc.relation.ispartofJournal of High Energy Physics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectFlavour Physics-
dc.subjectHadron-Hadron Scattering-
dc.subjectTau Physics-
dc.titleTest of lepton flavour universality in W-boson decays into electrons and <i>τ</i>-leptons using pp collisions at √s=13 TeV with the ATLAS detector-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1007/JHEP05(2025)038-
dc.identifier.scopuseid_2-s2.0-105012466849-
dc.identifier.volume2025-
dc.identifier.issue5-
dc.identifier.spage1-
dc.identifier.epage48-
dc.identifier.eissn1029-8479-
dc.identifier.isiWOS:001498829900001-
dc.identifier.issnl1029-8479-

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