Abstract
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 \( {\pi}^0\to \gamma \nu \overline{\nu} \), improving the current limit by more than three orders of magnitude.
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ArXiv ePrint: 1903.08767
Deceased (A. Zinchenko, V. Semenov, F. Hahn)
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The NA62 collaboration., Cortina Gil, E., Kleimenova, A. et al. Search for production of an invisible dark photon in π0 decays. J. High Energ. Phys. 2019, 182 (2019). https://doi.org/10.1007/JHEP05(2019)182
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DOI: https://doi.org/10.1007/JHEP05(2019)182