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- W2947635613 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 $4.12times10^8$ 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." @default.
- W2947635613 created "2019-06-07" @default.
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