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Search for heavy neutral lepton production in K+ decays

Research output: Contribution to journalArticle

  • E. Cortina Gil
  • E. Minucci
  • S. Padolski
  • P. Petrov
  • B. Velghe
  • G. Georgiev
  • V. Kozhuharov
  • L. Litov
  • T. Numao
  • D. Bryman
  • J. Fu
  • T. Husek
  • K. Kampf
  • M. Zamkovsky
  • R. Aliberti
  • G. Khoriauli
  • J. Kunze
  • D. Lomidze
  • R. Marchevski
  • L. Peruzzo
  • M. Vormstein
  • R. Wanke
  • P. Dalpiaz
  • M. Fiorini
  • E. Gamberini
  • I. Neri
  • A. Norton
  • F. Petrucci
  • H. Wahl
  • A. Cotta Ramusino
  • A. Gianoli
  • E. Iacopini
  • G. Latino
  • M. Lenti
  • A. Bizzeti
  • F. Bucci
  • R. Volpe
  • A. Antonelli
  • F. Gonnella
  • G. Lamanna
  • G. Lanfranchi
  • G. Mannocchi
  • S. Martellotti
  • M. Moulson
  • M. Raggi
  • T. Spadaro
  • F. Ambrosino
  • H. Heath
  • R. Page
  • S. Trilov
  • The NA62 Collaboration
Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalPhysics Letters B
Early online date28 Jan 2018
DateAccepted/In press - 12 Jan 2018
DateE-pub ahead of print - 28 Jan 2018
DatePublished (current) - 10 Mar 2018


A search for heavy neutral lepton production in K+ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the 10−7 to 10−6 level are established on the elements of the extended neutrino mixing matrix |Ue4|2 and |Uμ4|2 for heavy neutral lepton mass in the ranges 170–448 MeV/c2 and 250–373 MeV/c2, respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for |Ue4|2, and above 300 MeV/c2 for |Uμ4|2.

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