Questions regarding a family of extremely low-mass, electrically neutral particles described in the Standard Model of particle physics.
Neutrinos are described in the Standard Model of particle physics. They are leptons,but carry no electric charge. The existence of neutrinos was first predicted to account for missing energy in neutron decay. Neutrinos are extremely low-mass, and there is an ongoing debate in the scientific community as to whether they have any mass at all. They were also notoriously publicized by the supposed "Faster-than-light" experiment by the OPERA team that was later shown to have incorrect results.