Projected NA62 sensitivity to heavy neutral lepton production in K+→π0e+N decays

Jean-Loup Tastet, Evgueni Goudzovski, Inar Timiryasov, Oleg Ruchayskiy

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Abstract

Heavy neutral leptons (HNLs) appear in many extensions of the Standard Model of particle physics. In this study, we investigate to which extent the NA62 experiment at CERN could improve the existing bounds on the HNL mixing angle |Ue|2 by performing a missing mass search in K+ → π0e+N decays in flight. We show that the limit |Ue|2 ≃ 2 × 10−6 can be reached with the currently available data in the mass range 125–144 MeV, which is currently not well covered by production searches. Future data, together with a dedicated trigger and/or improvements in rejection of out-of-acceptance photons, can improve this limit by another order of magnitude.
Original languageEnglish
Article number055005
Number of pages7
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume104
Issue number5
DOIs
Publication statusPublished - 1 Sep 2021

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