Abstract
Large samples of charged kaon decays have been collected by the NA48/2 (2003-2004), the NA62-R[Formula: see text] (2007) and the NA62 (2015) experiments at CERN SPS. This proceedings summarizes upper limits on heavy neutrino production measured by these experiments. The results from the 2015 data analysis at the NA62 experiment are preliminary.
Highlights
The Standard Model (SM) of particle physics[1,2,3] does not describe the observed phenomenon of neutrino oscillations[4,5] because neutrinos are strictly massless in the SM and do not oscillate
The downstream part of the vacuum tank was sealed from a helium tank at atmospheric pressure, in which a magnetic spectrometer consisting of four drift chambers (DCHs) and a dipole magnet were housed
Due to the limited resolution on the longitudinal position of the vertex, it is impossible to distinguish a genuine three-track decay from the one mediated by a short-lived (τ 10 ps) Heavy Neutral Leptons (HNLs) that produces a pair of charged particles
Summary
The Standard Model (SM) of particle physics[1,2,3] does not describe the observed phenomenon of neutrino oscillations[4,5] because neutrinos are strictly massless in the SM and do not oscillate. The branching fraction of the production processes K+ → l+N can be expressed in terms of the branching fraction of the SM K+ → l+νl (Kl2) decays using kinematic factor ρl(mN ) accounting for the helicity suppression and phase space dependence on the HNL mass mN , and the mixing parameter |Ul4|2: B(K+ → l+N ) = B(K+ → l+νl) · ρl(mN ) · |Ul4|2. This proceedings describes three separate analyses performed at the NA48/2 experiment[8] and, its successor, the NA62 experiment at CERN SPS, aiming to observe HNL production (and decay). Subsequently the invariant mass spectra Mπμ have been scanned for a HNL signature
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