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

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 fnal 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 diferences 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 favour universality in W-boson decays.

Item Metadata

Title
Test of lepton favour universality in W-boson decays into electrons and τ -leptons using pp collisions at √s = 13 TeV with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2025-05-06
Description
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 fnal 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 diferences 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 favour universality in W-boson decays.
Subject
Flavour Physics; Hadron-Hadron Scattering; Tau Physics
Genre
Article
Type
Text
Language
eng
Date Available
2025-07-15
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0449405
URI
http://hdl.handle.net/2429/91615
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
Journal of High Energy Physics. 2025 May 06;2025(5):38
Publisher DOI
10.1007/JHEP05(2025)038
Peer Review Status
Reviewed
Scholarly Level
Faculty; Researcher
Copyright Holder
The Author(s)
Rights URI
http://creativecommons.org/licenses/by/4.0/
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Attribution 4.0 International (CC BY 4.0)