{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.151734.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2767173"}},{"@id":"https://doi.org/10.1103/PhysRevD.110.012014","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"- CERN-LHC. A search for charged-lepton-flavour violating $\\mu\\tau qt$ interactions is presented, considering both top-quark production and decay. The data analysed correspond to $140~\\textrm{fb}^{-1}$ of proton--proton collisions at a centre-of-mass energy of $\\sqrt{s}= 13$ TeV recorded with the ATLAS detector at the Large Hadron Collider. The analysis targets events containing two muons with the same electric charge, a hadronically decaying tau lepton and at least one jet, with exactly one $b$-tagged jet, produced by a $\\mu\\tau qt$ interaction. Agreement with the Standard Model expectation within $1.6\\sigma$ is observed, and limits are set at the $95\\%$ CL on the charged-lepton-flavour violation branching ratio of $\\mathcal{B}(t \\to \\mu\\tau q) < 8.7 \\times 10^{-7}$. An Effective Field Theory interpretation is performed yielding $95\\%$ CL limits on Wilson coefficients, dependent on the flavour of the associated light quark and the Lorentz structure of the coupling. These range from $c_{\\mathsf{lequ}}^{3(2313)} / \\Lambda^{2} < 0.10~\\textrm{TeV}^{-2}$ for $\\mu\\tau ut$ to $c_{\\mathsf{ lequ}}^{1(2323)} / \\Lambda^{2} < 1.78~\\textrm{TeV}^{-2}$ for $\\mu\\tau ct$. An additional search is performed for single scalar leptoquark production inducing charged lepton flavour violation, with fixed inter-generational couplings. Upper limits on leptoquark coupling strengths are set at the $95\\%$ CL, ranging from $\\lambda^{\\textrm{LQ}} = 1.26$ to $\\lambda^{\\textrm{LQ}} = 3.68$ for masses between $0.5$ and $2.0$ TeV.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t1","@type":"Dataset","description":"Observed event yields in $\\textrm{CR}t\\bar{t}\\mu$ compared with pre-fit expectations from Monte Carlo simulations, as a function of the scalar sum...","name":"Figure 4(a)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t2","@type":"Dataset","description":"Observed event yields in $\\textrm{CR}t\\bar{t}\\mu$ compared with post-fit expectations from Monte Carlo simulations, as a function of the scalar sum...","name":"Figure 4(b)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t3","@type":"Dataset","description":"Observed event yields in $\\textrm{SR}$ compared with pre-fit expectations from Monte Carlo simulations, as a function of the scalar sum...","name":"Figure 4(c)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t4","@type":"Dataset","description":"Observed event yields in $\\textrm{SR}$ compared with post-fit expectations from Monte Carlo simulations, as a function of the scalar sum...","name":"Figure 4(d)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t5","@type":"Dataset","description":"Expected and observed 95$\\%$ CL upper limits on the branching ratio corresponding to the decay of a top quark to...","name":"Figure 5(a)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t6","@type":"Dataset","description":"Expected and observed 95$\\%$ CL upper limits on the Wilson coefficients for scalar, vector and tensor couplings of a top...","name":"Figure 5(b)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t7","@type":"Dataset","description":"Observed event yields in $\\textrm{SR}$ compared with pre-fit expectations from Monte Carlo simulations, as a function of the scalar sum...","name":"Figure 6(a)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t8","@type":"Dataset","description":"Observed event yields in $\\textrm{SR}$ compared with post-fit expectations from Monte Carlo simulations, as a function of the scalar sum...","name":"Figure 6(b)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t9","@type":"Dataset","description":"Observed and expected exclusion 95$\\%$ CL upper limits on the $S_{1}$ leptoquark coupling strength $\\lambda^{\\textrm{LQ}}$ as a function of LQ...","name":"Figure 7(b)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t10","@type":"Dataset","description":"Theoretical cross-sections for single-top-quark production and top-quark decays through cLFV interactions involving vector, scalar and tensor EFT Wilson coefficients. The...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t11","@type":"Dataset","description":"Requirements for each analysis region. The symbol $\\ell_{3}$ denotes the lowest $p_{\\mathrm{T}}$ lepton. In $\\mathrm{CR}t\\bar{t}\\mu$ an additional requirement is placed...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t12","@type":"Dataset","description":"Post-fit event yields for each analysis region entering the fit, with correlations on the full systematic uncertainties taken into account...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t13","@type":"Dataset","description":"Expected and observed 95$\\%$ CL upper limits on Wilson coefficients corresponding to 2Q2L EFT operators which could introduce a cLFV...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t14","@type":"Dataset","description":"Expected and observed 95$\\%$ CL upper limits on the branching ratio ($\\mathcal{B}$) corresponding to the decay of a top quark...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t15","@type":"Dataset","description":"Expected and observed 95% CL upper limits on the inclusive branching ratio ($\\mathcal{B}$) corresponding to the decay of a top...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t16","@type":"Dataset","description":"Expected and observed 95$\\%$ CL upper limits on the Wilson coefficients corresponding to EFT operators inducing the decay of a...","name":"Aux Figure 2(a)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t17","@type":"Dataset","description":"Expected and observed 95$\\%$ CL upper limits on the Wilson coefficients corresponding to EFT operators inducing the decay of a...","name":"Aux Figure 2(b)"},{"@id":"https://doi.org/10.17182/hepdata.151734.v1/t18","@type":"Dataset","description":"Ranking of nuisance parameters by post-fit impact on cLFV signal strength $\\mu$ (the parameter of interest, POI). The pre-fit (post-fit)...","name":"Fit NP ranking"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2767173?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/151734"}],"inLanguage":"en","name":"Search for charged-lepton-flavour violating $\\mu\\tau qt$ interactions in top-quark production and decay in $pp$ collisions at $\\sqrt{s}= 13$ TeV with the ATLAS detector at the LHC","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2767173?version=1","version":1}