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

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dc.contributor.authorLeeuw, Lerothodi
dc.contributor.authorAad, Georges
dc.contributor.authorAakvaag, Erlend
dc.date.accessioned2026-01-21T10:36:45Z
dc.date.available2026-01-21T10:36:45Z
dc.date.issued2025
dc.description.abstractA 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.
dc.identifier.citationAlpigiani, C. et al. (2025) 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. The journal of high energy physics. [Online] 2025 (5), 38.
dc.identifier.urihttps://doi.org/10.1007/JHEP05(2025)038
dc.identifier.urihttps://hdl.handle.net/10566/21790
dc.language.isoen
dc.publisherSpringer Science and Business Media Deutschland GmbH
dc.subjectBranching fractions
dc.subjectElectrons
dc.subjectLeptons
dc.subjectFlavour Physics
dc.subjectHadron-Hadron Scattering
dc.titleTest of lepton flavour universality in W-boson decays into electrons and τ-leptons using pp collisions at = 13 TeV with the ATLAS detector
dc.typeArticle

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