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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

Aad G.
•
Aakvaag E.
•
Abbott B.
altro
Zwalinski L.
2025
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
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 s = 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.
DOI
10.1007/JHEP05(2025)038
Archivio
https://hdl.handle.net/11390/1312689
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-105012466849
https://ricerca.unityfvg.it/handle/11390/1312689
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
Soggetti
  • Flavour Physic

  • Hadron-Hadron Scatter...

  • Tau Physics

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