Test of lepton flavour universality in $W$-boson decays into electrons and $\tau$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector - INSPIRE

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Test of lepton flavour universality in $W$ -boson decays into electrons and $\tau$ -leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS

Collaboration

Dec 16, 2024

50 pages

e-Print:

2412.11989 [hep-ex]

Report number:

CERN-EP-2024-315

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (arXiv)

A measurement of the ratio of the branching fractions,

R_{\tau/e} = B(W \to \tau \nu)/ B(W \to e \nu)

, is performed using a sample of

W

bosons originating from top-quark decays to final states containing

\tau

-leptons or electrons. This measurement uses

pp

collisions at

\sqrt{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 \to \tau \nu_\tau

(with

\tau \to e \nu_e \nu_\tau

) and

W \to e \nu_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_{\tau/e} = 0.975 \pm 0.012 \textrm{(stat.)} \pm 0.020 \textrm{(syst.)}

, is consistent with the Standard Model assumption of lepton flavour universality in

W

-boson decays.

Note:

50 pages in total, author list starting page 33, 8 figures, 4 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2023-10

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