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

Risultato della ricerca: Contributo su rivista › Articolo in rivista › 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.

Lingua originale	Inglese
Numero di articolo	135599
Rivista	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	807
DOI	https://doi.org/10.1016/j.physletb.2020.135599
Stato di pubblicazione	Pubblicato - 10 ago 2020
Pubblicato esternamente	Sì

Accesso al documento

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",

}

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 - http://www.scopus.com/inward/record.url?scp=85087480211&partnerID=8YFLogxK

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