NAGIOS: RODERIC FUNCIONANDO

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

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	The NA62 Collaboration; Cortina Gil, Eduardo; Husek, Tomas
	This document is a artículoDate2020
	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/c^2, 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/c^2.
	The NA62 Collaboration Cortina Gil, Eduardo Husek, Tomas 2020 Search for heavy neutral lepton production in K+ decays to positrons Physics Letters B 807 135599
	https://doi.org/10.1016/j.physletb.2020.135599