Speaker
Description
"The NA62 experiment at CERN is designed to measure the highly-suppressed
decay K+ → π+ν¯
ν and has collected a large sample of K+ and π+ decays in
flight during Run 1 (2016–2018) and Run 2 (since 2021). Searches for the decays
K+ → π+X and π+ → e+N are presented using data collected in 2016–2022
and 2017–2024, respectively. No signal excess is observed and the results are
interpreted to constrain a range of New Physics scenarios. Upper limits on
the K+ → π+X branching ratio are established at the 10−11 level, providing
constraints on dark photon, scalar and ALP couplings. From the search for
heavy neutral lepton production in π+ → e+N decays of beam pions, upper
limits of the extended neutrino mixing matrix element |Ue4|2 are established at
the 10−8 level over the heavy neutral lepton mass range 95–126 MeV/c2
."
