The NA62 experiment at CERN Super Proton Synchrotron was designed to measure BR(K+ → π+νv̄) 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+νv̄ 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+ → π+π0 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.
|Title of host publication||Proceedings of the 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon|
|Editors||Curtis Meyer, Reinhard A. Schumacher|
|Publisher||American Institute of Physics (AIP)|
|Publication status||Published - 27 Jul 2020|
|Event||15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2019 - Pittsburgh, United States|
Duration: 2 Jun 2019 → 7 Jun 2019
|Name||AIP Conference Proceedings|
|Conference||15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2019|
|Period||2/06/19 → 7/06/19|
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