Search for heavy neutral lepton production in $K^{+}$ decays

Abstract

A search for heavy neutral lepton production in $K^{+}$ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the $10^{-7}$ to $10^{-6}$ level are established on the elements of the extended neutrino mixing matrix $|U_{\ell 4}{|}^2$ ($\ell =e,\mu$) for heavy neutral lepton mass in the range $170-448\mathrm{MeV}/c^2$. This improves on the results from previous production searches in $K^{+}$ decays, setting more stringent limits and extending the mass range.

Version accepted for publication in Phys.Lett.B (12/01/2018)

References in corpus (2)

• Search for heavy neutrinos in $K^{+}\to {\mu }^{+}{\nu }_H$ decays
• Test of Lepton Flavour Universality in K+ --> l+nu Decays

Cited by in corpus (18)

• Sterile Neutrinos
• The Present and Future Status of Heavy Neutral Leptons
• Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Search for heavy neutral lepton production in $K^{+}$ decays to positrons
• Search for $K^{+}$ decays to a muon and invisible particles
• The MicroBooNE Experiment, the NuMI Absorber, and Heavy Neutral Leptons
• Making the Universe at 20 MeV
• Search for long-lived heavy neutral leptons and Higgs portal scalars decaying in the MicroBooNE detector
• Heavy neutral leptons and high-intensity observables
• Heavy Neutrinos at the FCC-hh in the $U(1{)}_{B-L}$ Model
• Probing HNL-ALP couplings at colliders
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC
• Modelling Heavy Neutral Leptons in Accelerator Beamlines
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
• Techniques for mass peak reconstruction in Searches for Long-Lived Heavy Neutral Leptons Decaying to a Lepton and a \(ρ\) Meson
• Probing the Seesaw Mechanism and Leptogenesis with the International Linear Collider