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

The NA62 Collaboration

doi:10.1016/j.physletb.2020.135599

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

The NA62 Collaboration

Research output: Contribution to journal › Article › peer-review

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 |U_e4|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 |U_e4|² range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c².

Original language	English
Article number	135599
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	807
DOIs	https://doi.org/10.1016/j.physletb.2020.135599
Publication status	Published - 10 Aug 2020
Externally published	Yes

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10.1016/j.physletb.2020.135599

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@article{225c540b201c4cba8cf8a932b14ec65d,

title = "Search for heavy neutral lepton production in K+ decays to positrons",

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.",

author = "\{The NA62 Collaboration\} and \{Cortina Gil\}, E. and A. Kleimenova and E. Minucci and S. Padolski and P. Petrov and A. Shaikhiev and R. Volpe and T. Numao and Y. Petrov and B. Velghe and D. Bryman and J. Fu and T. Husek and J. Jerhot and K. Kampf and M. Zamkovsky and R. Aliberti and G. Khoriauli and J. Kunze and D. Lomidze and L. Peruzzo and M. Vormstein and R. Wanke and P. Dalpiaz and M. Fiorini and I. Neri and A. Norton and F. Petrucci and H. Wahl and \{Cotta Ramusino\}, A. and A. Gianoli and E. Iacopini and G. Latino and M. Lenti and A. Parenti and A. Bizzeti and F. Bucci and A. Antonelli and G. Georgiev and V. Kozhuharov and G. Lanfranchi and S. Martellotti and M. Moulson and T. Spadaro and F. Ambrosino and T. Capussela and M. Corvino and \{Di Filippo\}, D. and P. Massarotti and R. Arcidiacono",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s)",

year = "2020",

month = aug,

day = "10",

doi = "10.1016/j.physletb.2020.135599",

language = "English",

volume = "807",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Search for heavy neutral lepton production in K+ decays to positrons

AU - The NA62 Collaboration

AU - Cortina Gil, E.

AU - Kleimenova, A.

AU - Minucci, E.

AU - Padolski, S.

AU - Petrov, P.

AU - Shaikhiev, A.

AU - Volpe, R.

AU - Numao, T.

AU - Petrov, Y.

AU - Velghe, B.

AU - Bryman, D.

AU - Fu, J.

AU - Husek, T.

AU - Jerhot, J.

AU - Kampf, K.

AU - Zamkovsky, M.

AU - Aliberti, R.

AU - Khoriauli, G.

AU - Kunze, J.

AU - Lomidze, D.

AU - Peruzzo, L.

AU - Vormstein, M.

AU - Wanke, R.

AU - Dalpiaz, P.

AU - Fiorini, M.

AU - Neri, I.

AU - Norton, A.

AU - Petrucci, F.

AU - Wahl, H.

AU - Cotta Ramusino, A.

AU - Gianoli, A.

AU - Iacopini, E.

AU - Latino, G.

AU - Lenti, M.

AU - Parenti, A.

AU - Bizzeti, A.

AU - Bucci, F.

AU - Antonelli, A.

AU - Georgiev, G.

AU - Kozhuharov, V.

AU - Lanfranchi, G.

AU - Martellotti, S.

AU - Moulson, M.

AU - Spadaro, T.

AU - Ambrosino, F.

AU - Capussela, T.

AU - Corvino, M.

AU - Di Filippo, D.

AU - Massarotti, P.

AU - Arcidiacono, R.

PY - 2020/8/10

Y1 - 2020/8/10

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85087480211

U2 - 10.1016/j.physletb.2020.135599

DO - 10.1016/j.physletb.2020.135599

M3 - Article

SN - 0370-2693

VL - 807

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 135599

ER -

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

Abstract

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