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Test of the universality of τ and μ lepton couplings in W-boson decays with the ATLAS detector

Aad G.
•
Abbott B.
•
Abbott D. C.
altro
Zwalinski L.
2021
  • journal article

Periodico
NATURE PHYSICS
Abstract
The standard model of particle physics encapsulates our best current understanding of physics at the smallest scales. A fundamental axiom of this theory is the universality of the couplings of the different generations of leptons to the electroweak gauge bosons. The measurement of the ratio of the decay rate of W bosons to τ leptons and muons, R(τ/μ), constitutes an important test of this axiom. Using 139 fb−1 of proton–proton collisions recorded with the ATLAS detector at a centre-of-mass energy of 13 TeV, we report a measurement of this quantity from di-leptonic tt ̄ events where the top quarks decay into a W boson and a bottom quark. We can distinguish muons originating from W bosons and those originating from an intermediate τ lepton through the muon transverse impact parameter and differences in the muon transverse momentum spectra. The measured value of R(τ/μ) is 0.992 ± 0.013 [± 0.007(stat) ± 0.011(syst)] and is in agreement with the hypothesis of universal lepton couplings as postulated in the standard model. This is the only such measurement from the Large Hadron Collider, so far, and obtains twice the precision of previous measurements.
DOI
10.1038/s41567-021-01236-w
WOS
WOS:000669764700003
Archivio
http://hdl.handle.net/11390/1209374
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85111587526
Diritti
open access
Scopus© citazioni
6
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
18
Data di acquisizione
Mar 28, 2024
Visualizzazioni
3
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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