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    Cortina Gil, E.; Minucci, E.; Padolski, S.; Petrov, P.; Volpe, R.; Kozhuharov, V.; Velghe, B.; Bryman, D.; Jerhot, J.; Kampf, K.; Aliberti, R.; Kunze, J.; Neri, I.; Petrucci, F.; Gianoli, A.; Latino, G.; Lenti, M.; Parenti, A.; Bizzeti, A.; Bucci, F.; Martellotti, S.; Ambrosino, F.; Corvino, M.; Mirra, M.; Saracino, G.; Brizioli, F.; Imbergamo, E.; Lollini, R.; Pepe, M.; Piccini, M.; Giorgi, M.; Lamanna, G.; Lari, E.; Sozzi, M.; Cerri, C.; Mannelli, I.; D’Agostini, G.; Lonardo, A.; Bonaiuto, V.; Salamon, A.; Arcidiacono, R.; Bloch-Devaux, B.; Menichetti, E.; Soldi, D.; Biino, C.; Marchetto, F.; Engelfried, J.; Estrada-Tristan, N.; Bragadireanu, A. M.; Ghinescu, S. A.; Enik, T.; Korotkova, A.; Molokanova, N.; Movchan, S.; Polenkevich, I.; Potrebenikov, Yu; Fedotov, S.; Gushchin, E.; Khotyantsev, A.; Kudenko, Y.; Medvedeva, M.; Obraztsov, V.; Semenov, V.; Sugonyaev, V.; Yushchenko, O.; Bician, L.; Cerny, V.; Kucerova, Z.; Bernhard, J.; Danielsson, H.; De Simone, N.; Duval, F.; Gatignon, L.; Guida, R.; Koval, M.; Laycock, P.; Lichard, P.; Marchevski, R.; Noy, M.; Ryjov, V.; Schuchmann, S.; Venditti, S.; Duk, V.; Fry, J. R.; Gonnella, F.; Lazzeroni, C.; Lurkin, N.; Newson, F.; Parkinson, C.; Sergi, A.; Page, R.; Trilov, S.; Britton, D.; Dainton, J. B.; Jones, R. W. L.; Ruggiero, G.; Fulton, L.; Wrona, B.; Conovaloff, A.; Rubin, P.

    The journal of high energy physics, 28/5, Letnik: 2019, Številka: 5
    Journal Article

    A bstract The results of a search for π 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 × 10 8 tagged π 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 π 0 → γ ν ν ¯ , improving the current limit by more than three orders of magnitude.