Article ISI SCOPUS
Journal of High Energy Physics  (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

Aad G.; Aakvaag, E; Abbott B.; Abdelhameed, S; Abeling K.; Abicht N.J.; Abidi S.H.; Aboelela, M; Aboulhorma A.; Abramowicz H.; Abulaiti Y.; Acharya B.S.; Ackermann, A; Adam Bourdarios C.; Adamczyk L.; et. al.

Keywords: Hadron-Hadron Scattering, Flavour physics, Tau Physics

Abstract

A measurement of the ratio of the branching fractions, R?/e = B(W ? ??)/B(W ? e?), is performed using a sample of W bosons originating from top-quark decays to final states containing ?-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 ? ??? (with ? ? e?e??) and W ? e?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?/e = 0.975 ± 0.012 (stat.) ± 0.020 (syst.), is consistent with the Standard Model assumption of lepton flavour universality in W-boson decays. © The Author(s) 2025.

Más información

Título según WOS: 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
Título según SCOPUS: Test of lepton flavour universality in W-boson decays into electrons and ?-leptons using pp collisions at s = 13 TeV with the ATLAS detector
Título de la Revista: Journal of High Energy Physics
Volumen: 2025
Número: 5
Editorial: Springer Science and Business Media Deutschland GmbH
Fecha de publicación: 2025
Idioma: English
DOI:

10.1007/JHEP05(2025)038
Notas: ISI, SCOPUS