Physics beyond the standard model with kaons at NA62 Conference Paper uri icon


  • The NA62 experiment at CERN Super Proton Synchrotron was designed to measure BR(K%2b → π%2bνv̄) 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%2b → π%2bνv̄ from the full 2016 data set is described. Also a search for an invisible dark photon A′ has been performed, exploiting the efficient photon-veto capability and high resolution tracking of the NA62. The signal stems from the chain K%2b → π%2bπ0 followed by π0 → A′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/c2. © 2020 Author(s).


publication date

  • 2020-01-01