{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.141494.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2662303"}},{"@id":"https://doi.org/10.1140/epjc/s10052-023-11915-y","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2023","description":"A search for Majorana neutrinos in same-sign $W^{\\pm}W^{\\pm}$ scattering events is presented. The analysis uses the proton-proton collision data recorded by the ATLAS detector at $\\sqrt{s}= 13$ TeV at the Large Hadron Collider during the years 2015-2018, corresponding to an integrated luminosity of 140 fb$^{-1}$. The analysis targets final states including exactly two same-sign muons and at least two hadronic jets well separated in rapidity. The modelling of the main backgrounds from Standard Model, same-sign $W^{\\pm}W^{\\pm}$ scattering and $WZ$ production, are constrained with data in dedicated signal-depleted control regions and the transverse momenta of the sub-leading muon is used to search for signals originating from a heavy Majorana neutrino with masses of 50 GeV to 20 TeV. The presence of a signal is examined in a signal-enriched region and is interpreted in a benchmark scenario of the Phenomenological Type I Seesaw model. In addition, the sensitivity to the Weinberg operator is investigated.  No significant excess is observed over the background expectation. Upper limits at the  95% confidence level are provided on the squared muon heavy neutrino mixing element $\\vert V_{\\mu N} \\vert^{2}$ as a function of the heavy Majorana neutrino mass $m_N$, and on the effective $\\mu\\mu$ Majorana neutrino mass $|m_{\\mu\\mu}|$.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.141494.v1/t1","@type":"Dataset","description":"Observed and expected 95% CL upper limits on the heavy Majorana neutrino mixing element $\\vert V_{\\mu N} \\vert^{2}$ as a...","name":"Limits on Majorana HNL with muon coupling"},{"@id":"https://doi.org/10.17182/hepdata.141494.v1/t2","@type":"Dataset","description":"Cutflow for a selection of signal samples used in this analysis. The flavour-aligned scenario (in which $\\vert V_{\\mu N} \\vert^{2}=1$)...","name":"Signal Region Cutflow"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2662303?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/141494"}],"inLanguage":"en","name":"Search for Majorana neutrinos in same-sign $WW$ scattering events from $pp$ collisions at $\\sqrt{s}=13$ TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2662303?version=1","version":1}