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Search for production of an invisible dark photon in π0 decays

Research output: Contribution to journalJournal articlepeer-review

Article number182
<mark>Journal publication date</mark>28/05/2019
<mark>Journal</mark>Journal of High Energy Physics
Issue number5
Number of pages19
Publication StatusPublished
<mark>Original language</mark>English


The results of a search for π0 decays to a photon and an invisible massive
dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12×108 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 electro-weak decay π0 → γνν¯, improving the current limit by more than three orders of magnitude.