Search for production of an invisible dark photon in ${\pi }^0$ decays

Abstract

The results of a search for ${\pi }^0$ decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of $4.12\times 10^8$ tagged ${\pi }^0$ 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/$c^2$. The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay ${\pi }^0\to \gamma \nu \overline{\nu }$, improving the current limit by more than three orders of magnitude.

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