Search for production of an invisible dark photon in π0 decays

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Colleges, School and Institutes


The results of a search forπ0decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of4.12×10^8 tagged π0 mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass,improving on previous searches in the mass range 60–110 MeV/c2. The present results are interpreted in terms of an upper limit of the branching ratio of the electroweak decay π0→γν ̄ν, improving the current limit by more than three orders of magnitude.


Original languageEnglish
Pages (from-to)182
Publication statusPublished - 28 May 2019