The NA62 experiment recorded a large sample of K+ > mu+ nu(mu) decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. In the absence of a signal, limits in the range 2 x 10E-6 to 10E-5 have been set on the squared mixing matrix element |U(mu4)|^2 between muon and heavy neutrino states, for heavy neutrino masses in the range 300-375 MeV/c2. The result extends the range of masses for which upper limits have been set on the value of |U(mu4)|^2 in previous production search experiments.
Search for heavy neutrinos in K+ > mu+ nu(mu) decays
Dalpiaz, P.;Fiorini, M.;Petrucci, F.;
2017
Abstract
The NA62 experiment recorded a large sample of K+ > mu+ nu(mu) decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. In the absence of a signal, limits in the range 2 x 10E-6 to 10E-5 have been set on the squared mixing matrix element |U(mu4)|^2 between muon and heavy neutrino states, for heavy neutrino masses in the range 300-375 MeV/c2. The result extends the range of masses for which upper limits have been set on the value of |U(mu4)|^2 in previous production search experiments.File in questo prodotto:
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