{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.67658.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1357601"}},{"@id":"https://doi.org/10.1016/j.physletb.2015.04.068","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"NA48/2 Collaboration"},"creator":{"@type":"Organization","name":"NA48/2 Collaboration"},"datePublished":"2015","description":"CERN-NA-048.  A sample of $1.69\\times 10^7$ fully reconstructed $\\pi^0\\to\\gamma e^+e^-$ decay candidates collected by the NA48/2 experiment at CERN in 2003--2004 is analysed to search for the dark photon ($A'$) production in the $\\pi^0\\to\\gamma A'$ decay followed by the prompt $A'\\to e^+e^-$ decay. No signal is observed, and an exclusion region in the plane of the dark photon mass $m_{A'}$ and mixing parameter $\\varepsilon^2$ is established. The obtained upper limits on $\\varepsilon^2$ are more stringent than the previous limits in the mass range $9~{\\rm MeV}/c^2<m_{A'}<70~{\\rm MeV}/c^2$. The NA48/2 sensitivity to the dark photon production in the $K^\\pm\\to\\pi^\\pm A'$ decay is also evaluated.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.67658.v1/t1","@type":"Dataset","description":"The obtained 90% CL upper limits (ULs) on the mixing parameter $\\epsilon^2$ for each dark photon (DP) mass hypothesis tested.","name":"Table 1"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1357601?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/67658"}],"inLanguage":"en","name":"Search for the dark photon in $\\pi^0$ decays","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1357601?version=1","version":1}