The number of possible classes of this particle is determined by observing Z boson decay.
The number of possible classes of this particle is determined by observing Z boson decay. A model of these particles predicts two sets of masses, one on the GUT scale, via a seesaw mechanism; that model suggests that a type of these particles exists that only interacts via gravity, the "sterile" type. Data collected from these particles (*) emitted by the sun showed that their mass and flavor eigenstates are slightly different, leading to namesake "oscillations." A primary component of hot dark matter, one of these particles is produced along with a beta particle in beta decay. For 10 points, name this low-mass electrically neutral lepton named by Enrico Fermi to suggest a "little neutron."
The number of possible classes of this particle is determined by observing Z boson decay.
{neutrino} [do not accept “{neutron}”]