The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model- independent upper limit on the branching ratio for the decay K+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming X to be an axion-like particle with dominant fermion couplings or a dark scalar mix...
The results of a search for π0 decays to a photon and an invisible massive dark photon at the NA62 e...
We search for J/ψ radiative decays into a weakly interacting neutral particle, namely an invisible p...
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+ ...
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 CERN reports searches for K+→μ+N and K+→μ+νX decays, where N and X are massiv...
The NA62 experiment at the CERN SPS reports a study of a sample of $4 \times10^{9}$ tagged $\pi^0$ m...
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 ...
2-s2.0-85098916005The search for an invisible vector boson from π0 decays at the NA62 experiment at ...
The results of a search for π0 decays to a photon and an invisible massive dark photon at the NA62 e...
The results of a search for π0 decays to a photon and an invisible massive dark photon at the NA62 e...
We search for J/ψ radiative decays into a weakly interacting neutral particle, namely an invisible p...
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+ ...
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 CERN reports searches for K+→μ+N and K+→μ+νX decays, where N and X are massiv...
The NA62 experiment at the CERN SPS reports a study of a sample of $4 \times10^{9}$ tagged $\pi^0$ m...
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 ...
2-s2.0-85098916005The search for an invisible vector boson from π0 decays at the NA62 experiment at ...
The results of a search for π0 decays to a photon and an invisible massive dark photon at the NA62 e...
The results of a search for π0 decays to a photon and an invisible massive dark photon at the NA62 e...
We search for J/ψ radiative decays into a weakly interacting neutral particle, namely an invisible p...
A search for the K+ → π+X decay, where X is a long-lived feebly interacting particle, is performed t...