{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.172084.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3130442"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2026","description":"The first measurement of the magnitude of the CKM quark mixing matrix element $|V_{cb}|$ using on-shell $W$-boson decays is presented. The measurement is made with $t\\bar{t}$ events from $pp$ collision data corresponding to an integrated luminosity of $140$ fb$^{-1}$ at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. A value of: \n$$|V_{cb}| = (50^{+11}_{-14})\\times10^{-3}$$\n is measured, where the uncertainties have roughly equal contributions from the limited size of the data sample and from systematic effects. This is consistent with existing measurements made at much lower energy scales in $B$ hadron decays. While the sensitivity does not yet rival that of previous determinations, this novel approach probes a very different physical situation, namely the rare hadronic $t\\rightarrow b\\bar{b} c$ decay at high momentum-transfer, rather than semileptonic $B$ decays at low momentum-transfer.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t1","@type":"Dataset","description":"Summary of the final measured $|V_{cb}|$ result. The measurement uses single-lepton $t\\bar{t}$ events in $140\\,\\mathrm{fb}^{-1}$ of $pp$ collision data at...","name":"Summary of the final result"},{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t2","@type":"Dataset","description":"Ranking of the fifteen most significant impacts of individual systematic uncertainties in $\\mu_{|V_{cb}|}$ using the covariance method. The dots show...","name":"Ranking plot of systematic uncertainties in $|V_{cb}|$"},{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t3","@type":"Dataset","description":"Pre-fit data and predicted event yields for all analysis regions and Neural Network (NN) output score bins used in the...","name":"Pre-fit yields in all regions"},{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t4","@type":"Dataset","description":"Post-fit data and predicted event yields for all analysis regions and Neural Network (NN) output score bins used in the...","name":"Post-fit yields in all regions"},{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t5","@type":"Dataset","description":"Observed and expected negative log-likelihood scans for the $|V_{cb}|$ extraction as a function of $\\mu_{|V_{cb}|}$. In this table, $\\mu_{|V_{cb}|}$ is...","name":"Likelihood scan for $|V_{cb}|$"},{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t6","@type":"Dataset","description":"Full ranking of individual systematic uncertainties in $\\mu_{|V_{cb}|}$ using the covariance method. The uncertainties are grouped by systematic category and...","name":"Full ranking of systematic uncertainties in $|V_{cb}|$"},{"@id":"https://doi.org/10.17182/hepdata.172084.v1/t7","@type":"Dataset","description":"Full post-fit correlation matrix of the fitted parameters and nuisance parameters. Systematic uncertainties are grouped by category and ordered within...","name":"Full nuisance-parameter correlation matrix"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3130442?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/172084"}],"inLanguage":"en","name":"Measurement of the $|V_{cb}|$ element of the CKM matrix in $t\\bar{t}$ decays with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3130442?version=1","version":1}