The NA62 experiment at CERN reports searches for K+→μ+N and K+→μ+νX decays, where N and X are massive invisible particles, using the 2016–2018 data set. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−8) of the neutrino mixing parameter |Uμ4|2 for N masses in the range 200–384 MeV/c2 and lifetime exceeding 50 ns. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10–370 MeV/c2 are reported for the first time, ranging from O(10−5) to O(10−7). An improved upper limit of 1.0×10−6 is established at 90% CL on the K+→μ+ννν¯ branching fraction
International audienceThe NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak ...
The NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak search has been perfor...
The NA62 experiment recorded a large sample of K+ -> mu(+)nu(mu)decays in 2007. A peak search has be...
The NA62 experiment at CERN reports searches for K+ → μ+N and K+ → μ+νX decays, where N and X are ma...
The NA62 experiment at CERN reports searches for K + → μ+N and K + → μ+ν X decays, where N and X are...
The NA62 experiment at CERN reports searches for K+ → e+N, K+→μ+N and K+→μ+νX decays, where N and X ...
Searches for heavy neutral leptons N in the K+ → e+N and K+ → μ+N decay channels using the dataset c...
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ ...
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ ...
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ ...
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed t...
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed t...
The NA62 experiment at the CERN SPS reports a study of a sample of 4×109 tagged π0 mesons from K+ → ...
Searches for heavy neutral lepton production in K+ ? e+N and K+ ? µ+N decays using the data set coll...
The decay K+ → π+νν¯ with a very precisely predicted branching ratio of less than 10−10 is one of th...
International audienceThe NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak ...
The NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak search has been perfor...
The NA62 experiment recorded a large sample of K+ -> mu(+)nu(mu)decays in 2007. A peak search has be...
The NA62 experiment at CERN reports searches for K+ → μ+N and K+ → μ+νX decays, where N and X are ma...
The NA62 experiment at CERN reports searches for K + → μ+N and K + → μ+ν X decays, where N and X are...
The NA62 experiment at CERN reports searches for K+ → e+N, K+→μ+N and K+→μ+νX decays, where N and X ...
Searches for heavy neutral leptons N in the K+ → e+N and K+ → μ+N decay channels using the dataset c...
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ ...
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ ...
The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ ...
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed t...
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed t...
The NA62 experiment at the CERN SPS reports a study of a sample of 4×109 tagged π0 mesons from K+ → ...
Searches for heavy neutral lepton production in K+ ? e+N and K+ ? µ+N decays using the data set coll...
The decay K+ → π+νν¯ with a very precisely predicted branching ratio of less than 10−10 is one of th...
International audienceThe NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak ...
The NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak search has been perfor...
The NA62 experiment recorded a large sample of K+ -> mu(+)nu(mu)decays in 2007. A peak search has be...