{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.160245.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2953428"}},{"@id":"https://doi.org/10.1007/JHEP11(2025)143","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"NA62 Collaboration"},"creator":{"@type":"Organization","name":"NA62 Collaboration"},"datePublished":"2025","description":"Results from the study of the rare decays $K^{+}\\rightarrow\\pi^{+}\\nu\\bar{\\nu}$, $K^{+}\\rightarrow\\pi^{+}\\mu^{+}\\mu^{-}$ and $K^{+}\\rightarrow\\pi^{+}\\gamma\\gamma$ at the NA62 experiment at CERN are interpreted in terms of improved limits for $\\rm{B}(K^{+}\\rightarrow\\pi^{+}X)$ and coupling parameters of hidden-sector models, where X is a mediator. World-leading limits are achieved for dark photon, dark scalar and axion-like particle models.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t1","@type":"Dataset","description":"Number of expected and observed events as a function of squared missing mass.","name":"Figure 1-a"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t2","@type":"Dataset","description":"Single Event Sensitivity (SES) for the $K^{+}\\rightarrow\\pi^{+}X$ search as a function of X mass.","name":"Figure 1-b"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t3","@type":"Dataset","description":"Model-independent constraints on the branching ratio of the $K^{+}\\rightarrow\\pi^{+}X$ decay","name":"Figure 2-a"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t4","@type":"Dataset","description":"Observed model-independent upper limits at 90 % CL of $\\mathcal{B}(K^{+}\\rightarrow\\pi^{+}X)$ as function of $X$ mass, for several $X$ lifetime hypotheses,...","name":"Figure 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the kinetic mixing coupling squared, $\\varepsilon^{2}$, as a function of $m_{A^{\\prime}}$ for...","name":"Figure 8-a"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t9","@type":"Dataset","description":"Excluded region, at 90 % CL, of the parameter space $(m_{A^{\\prime}},\\varepsilon)$ for a dark photon $A^{\\prime}$, decaying invisibly, in the...","name":"Figure 8-b : $K^{+}\\rightarrow\\pi^{+}X_{\\rm inv}$"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t10","@type":"Dataset","description":"Excluded region, at 90 % CL, of the parameter space $(m_{A^{\\prime}},\\varepsilon)$ for a dark photon $A^{\\prime}$, decaying invisibly, in the...","name":"Figure 8-b : $\\pi^{0}\\rightarrow{\\rm inv}$"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t11","@type":"Dataset","description":"Branching ratio of the $K^{+}\\rightarrow\\pi^{+}S$ decay divided by $\\text{sin}^{2}\\theta$, as a function of $m_{S}$.","name":"Figure 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scalar S, in the BC4 model,...","name":"Figure 9-d : $K^{+}\\rightarrow\\pi^{+}\\mu^{+}\\mu^{-}$"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t16","@type":"Dataset","description":"Branching ratio of the $K^{+}\\rightarrow\\pi^{+}a$ decay divided by $(C_{ff}/\\Lambda)^{2}$, as a function of $m_{a}$, assuming \u039b = 1 TeV.","name":"Figure 10-a"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t17","@type":"Dataset","description":"Excluded regions, at 90 % CL, of the parameter space $(m_{a}, C_{ff}/\\Lambda)$ for an ALP $a$, in the BC10-inv model,...","name":"Table 10-b : $K^{}\\rightarrow\\pi^{+}X_{\\rm inv}$"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t18","@type":"Dataset","description":"Excluded regions, at 90 % CL, of the parameter space $(m_{a}, C_{ff}/\\Lambda)$ for an ALP $a$, in the BC10-inv model,...","name":"Table 10-b : $\\pi^{0}\\rightarrow\\rm{inv}$"},{"@id":"https://doi.org/10.17182/hepdata.160245.v2/t19","@type":"Dataset","description":"Excluded 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