{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.69636.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/878312"}},{"@id":"https://doi.org/10.1016/j.physletb.2011.01.042","@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 3120 $K^\\pm\\to\\pi^\\pm\\mu^+\\mu^-$ decay candidates with $(3.3\\pm0.7)\\%$ background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a detailed study of the decay properties. The branching ratio was measured to be ${\\rm BR}=(9.62\\pm0.25)\\times 10^{-8}$. The form factor $W(z)$, where $z=(M_{\\mu\\mu}/M_K)^2$, was parameterized according to several models. In particular, the slope of the linear form factor $W(z)=W_0(1+\\delta z)$ was measured to be $\\delta=3.11\\pm0.57$. Upper limits of $2.9\\times 10^{-2}$ and $2.3\\times 10^{-2}$ on possible charge asymmetry and forward-backward asymmetry were established at 90% CL. An upper limit ${\\rm BR}(K^\\pm\\to\\pi^\\mp\\mu^\\pm\\mu^\\pm)<1.1\\times 10^{-9}$ was established at 90% CL for the rate of the lepton number violating decay.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.69636.v1/t1","@type":"Dataset","description":"The $d\\Gamma_{\\pi\\mu\\mu}/dz$ spectrum (background subtracted, corrected for trigger efficiency). Systematic errors, notably the external one due to the branching ratios...","name":"Table 1"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins878312?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/69636"}],"inLanguage":"en","name":"New measurement of the K+- --> pi+-mu+mu- decay","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins878312?version=1","version":1}