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.
2017
Lazzeroni, C.; Lurkin, N.; Newson, F.; Romano, A.; Ceccucci, A.; Danielsson, H.; Falaleev, V.; Gatignon, L.; Goy Lopez, S.; Hallgren, B.; Maier, A.; P...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2384334
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