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 vertical bar U-e4 vertical bar(2)and vertical bar U-mu 4 vertical bar(2)for heavy neutral lepton mass in the ranges 170-448MeV c(2) and 250-373MeV/c(2), respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for vertical bar U-e4 vertical bar(2), and above 300MeV/c(2) for vertical bar U-mu 4 vertical bar(2)
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 (N) production in K+ -> mu N+ and K+ -> e(+)N decays is carr...
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 (N) production in K+ -> mu N+ and K+ -> e(+)N decays is carr...
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 (N) production in K+ -> mu N+ and K+ -> e(+)N decays is carr...