2017/12/31 by NA62 collaboration, E. Cortina, E. Minucci +98 · 2 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Electron #Large Hadron Collider #Lepton #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Range (aeronautics) #hep-ex
paper · pdf · doi:10.1016/j.physletb.2018.01.031
Version accepted for publication in Phys.Lett.B (12/01/2018)
openalex created_date 2017/12/22 · arxiv created 2018/01/12 · openalex publication_date 2018/01/28 · arxiv updated 2018/02/01 · openalex updated_date 2026/08/05
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 | U e 4 | 2 and | U μ 4 | 2 for heavy neutral lepton mass in the ranges 170–448 MeV/ c 2 and 250–373 MeV/ c 2 , respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for | U e 4 | 2 , and above 300 MeV/ c 2 for | U μ 4 | 2 .