Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at root s=13 TeV with the ATLAS detector

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F24%3A00380666" target="_blank" >RIV/68407700:21220/24:00380666 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21240/24:00380666 RIV/68407700:21340/24:00380666 RIV/68407700:21670/24:00380666
Result on the web
<a href="https://doi.org/10.1140/epjc/s10052-024-13070-4" target="_blank" >https://doi.org/10.1140/epjc/s10052-024-13070-4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-024-13070-4" target="_blank" >10.1140/epjc/s10052-024-13070-4</a>

Result language
angličtina
Original language name
Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at root s=13 TeV with the ATLAS detector
Original language description
The ratio of branching ratios of the W boson to muons and electrons, R-W(mu/e) = B(W -> mu nu)/B(W -> e nu), has been measured using 140 fb(-1) of pp collision data at root s = 13TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the t (t) over bar production cross-section in the ee, e mu and mu mu dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio R-Z(mu mu/ee) for the Z boson measured in inclusive Z -> ee and Z -> mu mu events. By using the precise value of R-Z(mu mu/ee) determined from e(+)e(-) colliders, the ratio R-W(mu/e) is determined to be R-W(mu/e) = 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-Z(mu mu/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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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