Search for heavy neutral lepton production in K+ decays to positrons



Cortina Gil, E, Kleimenova, A, Minucci, E, Padolski, S, Petrov, P, Shaikhiev, A, Volpe, R, Numao, T, Petrov, Y, Velghe, B
et al (show 192 more authors) (2020) Search for heavy neutral lepton production in K+ decays to positrons. Physics Letters B, 807. p. 135599.

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Abstract

A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by the NA62 experiment at CERN in 2017–2018 is reported. Upper limits of the extended neutrino mixing matrix element |Ue4|2 are established at the level of 10−9 over most of the accessible heavy neutral lepton mass range 144–462 MeV/c2, with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The |Ue4|2 range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c2.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 17 Jul 2020 07:57
Last Modified: 20 Jun 2024 20:12
DOI: 10.1016/j.physletb.2020.135599
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3094255