A search for heavy neutral lepton production in K+ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the 10⁻⁷ to 10⁻⁶ level are established on the elements of the extended neutrino mixing matrix |Ue4|² and |Uμ4|² for heavy neutral lepton mass in the ranges 170–448 MeV/c² and 250–373 MeV/c², respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for |Ue4|², and above 300 MeV/c² for |Uμ4|²
A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with a mi...
A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by...
Searches for heavy neutral lepton production in K+ → e+N and K+ → μ+N decays using the data set coll...
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minim...
A search for heavy neutral lepton production in K + decays using a data sample collected with a mini...
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minim...
A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by...
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minim...
A search for heavy neutral lepton production in decays using a data sample collected with a minimum ...
A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with a mi...
A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by...
Searches for heavy neutral lepton production in K+ → e+N and K+ → μ+N decays using the data set coll...
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minim...
A search for heavy neutral lepton production in K + decays using a data sample collected with a mini...
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minim...
A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by...
A search for heavy neutral lepton production in K+ decays using a data sample collected with a minim...
A search for heavy neutral lepton production in decays using a data sample collected with a minimum ...
A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with a mi...
A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by...
Searches for heavy neutral lepton production in K+ → e+N and K+ → μ+N decays using the data set coll...