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

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

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dc.contributor.author The NA62 Collaboration
dc.contributor.author Cortina Gil, Eduardo
dc.contributor.author Husek, Tomas
dc.date.accessioned 2021-04-26T13:28:35Z
dc.date.available 2021-04-26T13:28:35Z
dc.date.issued 2020
dc.identifier.uri https://hdl.handle.net/10550/78918
dc.description.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/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.
dc.language.iso eng
dc.relation.ispartof Physics Letters B, 2020, vol. 807, num. 135599
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source 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
dc.subject Astrofísica
dc.subject Física
dc.title Search for heavy neutral lepton production in K+ decays to positrons
dc.type info:eu-repo/semantics/article
dc.date.updated 2021-04-26T13:28:35Z
dc.identifier.doi https://doi.org/10.1016/j.physletb.2020.135599
dc.identifier.idgrec 145770

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