P. Massarotti, R. Aliberti, F. Ambrosino, R. Ammendola, B. Angelucci, A. Antonelli, G. Anzivino, R. Arcidiacono, M. Barbanera, A. Biagioni, L. Bician, C. Biino, A. Bizzeti, T. Blažek, B. Bloch-Devaux, V. Bonaiuto, M. Boretto, M. Bragadireanu, D. Britton, F. Brizioli, M. Brunetti, D. Bryman, F. Bucci, T. Capussela, A. Ceccucci, P. Cenci, V. Cerný, C. Cerri, B. Checcucci, A. Conovalo, P. Cooper, E. Gil, M. Corvino, F. Costantini, A. C. Ramusino, D. Coward, G. D'Agostini, J. Dainton, P. Dalpiaz, H. Danielsson, N. Simone, D. Filippo, P. Laycock, L. Lella, N. Doble, B. Döbrich, F. Duval, V. Duk, J. Engelfried, T. Enik, N. Estrada-Tristan, V. Falaleev, R. Fantechi, V. Fascianelli, L. Federici, S. Fedotov, A. Filippi, M. Fiorini, J. Fry, J. Fu, A. Fucci, L. Fulton, E. Gamberini, L. Gatignon, G. Georgiev, S. Ghinescu, A. Gianoli, M. Giorgi, S. Giudici, F. Gonnella, E. Goudzovski, C. Graham, R. Guida, E. Gushchin, F. Hahn, H. Heath, T. Husek, O. Hutanu, D. Hutchcroft, L. Iacobuzio, E. Iacopini, E. Imbergamo, B. Je
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Abstract
. The NA62 experiment at CERN Super Proton Synchrotron was designed to measure BR( K + → π + ν ¯ ν ) with an in-fight technique, never used before for this measurement. This decay is characterised by a very precise prediction in the Standard Model. Its branching ratio, which is expected to be less than 10 − 10 , is one of the best candidates to indicate indirect effects of new physics beyond SM at the highest mass scales. NA62 result on K + → π + ν ¯ ν from the full 2016 data set is described. Also a search for an invisible dark photon A (cid:3) has been performed, exploiting the efficient photon-veto capability and high resolution tracking of the NA62. The signal stems from the chain K + → π + π 0 followed by π 0 → A (cid:3) γ . No significant statistical excess has been identified. Upper limits on the dark photon coupling to the ordinary photon as a function of the dark photon mass have been set, improving on the previous limits over the mass range 60 - 110 MeV/ c 2 .
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