Abstract
In this paper we present new results on upper limits for the search of Heavy Neutral Leptons (HNL) with data collected by NA48/2 (2003-2004), NA62-RK (2007) and NA62 (2015) CERN experiments. The data collected with different trigger configuration allow to search for both long and short living heavy neutrinos in the mass range below the kaon mass. In addition the status of the search for K+ → π+vv with the NA62 detector will be briefly presented.
Highlights
Neutrinos in Standard Model (SM) are mass-less, the experimental observation of neutrinos oscillations is a clear indication that neutrinos are massive
An about 150 m long decay region is followed by a straw tubes spectrometer in vacuum in order to minimize the material present along the path of the photons produced in kaon decays
These photons are detected by the liquid Krypton calorimeter (LKr) calorimeter and a system of vetoes placed along the fiducial volume (12 rings of lead glass) and around the beam direction
Summary
Neutrinos in Standard Model (SM) are mass-less, the experimental observation of neutrinos oscillations is a clear indication that neutrinos are massive. The lightest, with mass O(1 keV) is considered as a possible dark matter candidate, while the others, with mass ranging from hundreds of MeV to few GeV, give masses to the SM neutrinos through the see-saw mechanism and introduce phases in SM, with respect to the CKM phases, becoming a new source of CP violation The masses of these Heavy Neutral Leptons (HNL) are chosen to be below the electroweak scale and, in principle, can be produced in meson decays. An about 150 m long decay region is followed by a straw tubes spectrometer in vacuum in order to minimize the material present along the path of the photons produced in kaon decays (mainly K+ → π+π0) These photons are detected by the LKr calorimeter and a system of vetoes placed along the fiducial volume (12 rings of lead glass) and around the beam direction. A detailed description of the NA62 beam line and detectors can be found in [5]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
