{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.147012.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2788405"}},{"@id":"https://doi.org/10.1140/epjc/s10052-024-13244-0","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"A search is reported for charge-parity $CP$ violation in D$^0$$\\to$ K$^0_\\mathrm{S}$K$^0_\\mathrm{S}$ decays, using data collected in proton-proton collisions at $\\sqrt{s}$ = 13 TeV recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6 fb$^{-1}$, which consists of about 10 billion events containing a pair of b hadrons, nearly all of which decay to charm hadrons. The flavor of the neutral D meson is determined by the pion charge in the reconstructed decays D$^{*+}$$\\to$ D$^0\\pi^+$ and D$^{*-}$$\\to$ D$^0\\pi^-$. The $CP$ asymmetry in D$^0$$\\to$ K$^0_\\mathrm{S}$K$^0_\\mathrm{S}$ is measured to be $A_{CP}$(K$^0_\\mathrm{S}$K$^0_\\mathrm{S}$) = (6.2 $\\pm$ 3.0 $\\pm$ 0.2 $\\pm$ 0.8)%, where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the $CP$ asymmetry in the D$^0$ $\\to$ K$^0_\\mathrm{S}\\pi^+\\pi^-$ decay. This is the first $CP$ asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.147012.v1/t1","@type":"Dataset","description":"The measured $CP$ asymmetry in $D^{0} \\to K^{0}_{S} K^{0}_{S}$","name":"Table 1. Results for the CP asymmetry"},{"@id":"https://doi.org/10.17182/hepdata.147012.v1/t2","@type":"Dataset","description":"The measured difference in the $CP$ asymmetries between $D^{0} \\to K^{0}_{S} K^{0}_{S}$ and $D^{0} \\to K^{0}_{S}\\pi^{+}\\pi^{-}$","name":"Table 2. Results for the difference in CP asymmetries"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2788405?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/147012"}],"inLanguage":"en","name":"Search for $CP$ violation in D$^0$$\\to$ K$^0_\\mathrm{S}$K$^0_\\mathrm{S}$ decays in proton-proton collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2788405?version=1","version":1}