{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.153467.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2764810"}},{"@id":"https://doi.org/10.1140/epjc/s10052-024-13070-4","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2024","description":"The ratio of branching ratios of the $W$ boson to muons and electrons, $R^{\\mu/e}_W=B(W \\to \\mu\\nu)/B(W \\to e\\nu)$, has been measured using 140 fb${}^{-1}$ of $pp$ collision data at $\\sqrt{s}=13$ TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the $t\\bar{t}$ 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 $R^{\\mu\\mu/ee}_Z$ for the $Z$ boson measured in inclusive $Z \\to ee$ and $Z\\to\\mu\\mu$ events. By using the precise value of $R^{\\mu\\mu/ee}_Z$ determined from $e^+e^-$ colliders, the ratio $R^{\\mu/e}_W$ is determined to be $R^{\\mu/e}_W$ = $0.9995 \\pm 0.0022 \\pm 0.0036 \\pm 0.0014$. The three uncertainties correspond to data statistics, experimental systematics and the external measurement of $R^{\\mu\\mu/ee}_Z$, 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.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.153467.v1/t1","@type":"Dataset","description":"The measurement of the ratio of the rate of decay of W bosons to muons and electrons, $R(\\mu/e)=B(W\\rightarrow\\mu\\nu)/B(W\\rightarrow e\\nu)$.","name":"Table 1"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2764810?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/153467"}],"inLanguage":"en","name":"Precise test of lepton flavour universality in $W$-boson decays into muons and electrons in $pp$ collisions at $\\sqrt{s}=13$ TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2764810?version=1","version":1}