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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

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The ratio of branching ratios of the W boson to muons and electrons, R μ/e W = B(W → μν)/B(W → eν), has been measured using 140 fb−1 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...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Rio, Fernando del (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Ott, Philipp (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Sauer, Christof (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 1 October 2024
In: The European physical journal. C, Particles and fields
Year: 2024, Volume: 84, Issue: 10, Pages: 1-33
ISSN:1434-6052
DOI:10.1140/epjc/s10052-024-13070-4
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-024-13070-4
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1140/epjc/s10052-024-13070-4
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Author Notes:ATLAS Collaboration
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Summary:The ratio of branching ratios of the W boson to muons and electrons, R μ/e W = B(W → μν)/B(W → eν), has been measured using 140 fb−1 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 t ¯t 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 R μμ/ee Z for the Z boson measured in inclusive Z → ee and Z → μμ events. By using the precise value of R μμ/ee Z determined from e+e− colliders, the ratio R μ/e W is determined to be R μ/e W = 0.9995 ± 0.0022 (stat) ± 0.0036 (syst) ± 0.0014 (ext). The three uncertainties correspond to data statistics, experimental systematics and the external measurement of R μμ/ee Z , 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.
Item Description:ATLAS Collaboration: G. Aad, A. Ackermann, L.M. Baltes, F. Bartels, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, L. Sanfilippo, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser und weitere 2879
Gesehen am 14.10.2025
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-024-13070-4

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