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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
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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

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
The journal of high energy physics, 卷.2025(5), 頁.38
2025
Web of Science ID: WOS:001498829900001

摘要

Classical and Quantum Gravitation Elementary Particles Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Experimental Physics Relativity Theory String Theory
A bstract A measurement of the ratio of the branching fractions, R τ/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 → τν τ (with τ → eν e ν τ ) and W → eν 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 τ/e = 0 . 975 ± 0 . 012 (stat.) ± 0 . 020 (syst.), is consistent with the Standard Model assumption of lepton flavour universality in W -boson decays.

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https://doi.org/10.1007/JHEP05(2025)038檢視
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