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Search for production of an invisible dark photon in π0 decays

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	The NA62 Collaboration; Cortina Gil, Eduardo; Kleimenova, A.; Minucci, E.; Husek, Tomas
	This document is a artículoDate2019
	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 x 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/c^2. 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.
	The NA62 Collaboration Cortina Gil, Eduardo Kleimenova, A. Minucci, E. Husek, Tomas 2019 Search for production of an invisible dark photon in π0 decays The Journal of high energy physics 05 182
	https://doi.org/10.1007/JHEP05(2019)182