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Article
Report number arXiv:2403.02133 ; CERN-EP-2024-063
Title Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at s=13 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  顯示全部 2940 名作者
Corporate Author(s) ATLAS Collaboration
Publication 2024-10-01
Imprint 05 Mar 2024
Number of pages 33
Note 46 pages in total, author list starting page 29, 6 figures, 5 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2023-28/
In: Eur. Phys. J. C 84 (2024) 993
DOI 10.1140/epjc/s10052-024-13070-4 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords electroweak interaction ; conservation law tests ; experimental results ; Lepton universality test ; top quark events ; W decays
Abstract The ratio of branching ratios of the W boson to muons and electrons, RWμ/e=B(Wμν)/B(Weν), has been measured using 140 fb1 of pp collision data at s=13 TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the tt¯ production cross-section in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio RZμμ/ee for the Z boson measured in inclusive Zee and Zμμ events. By using the precise value of RZμμ/ee determined from e+e colliders, the ratio RWμ/e is determined to be RWμ/e=0.9995±0.0022±0.0036±0.0014. The three uncertainties correspond to data statistics, experimental systematics and the external measurement of RZμμ/ee, giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W-boson decays at the 0.5% level.
Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)
Publication: © 2024-2025 CERN (License: CC BY 4.0), sponsored by SCOAP³



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 記錄創建於2024-03-05,最後更新在2024-10-30


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