sterile neutrino

From Physicsworld, June 4, 2018: Physicists working on the Mini Booster Neutrino Experiment (MiniBooNE) at Fermilab in the US have released new results that they argue provide strong evidence for the existence of a new type of particle known as a sterile neutrino.

From Quanta, June 1, 2018: MiniBooNE, a Fermilab experiment, has detected far more electron neutrinos than predicted — a possible harbinger of a revolutionary new elementary particle called the sterile neutrino, though many physicists remain skeptical.

Only neutrinos with a specific spin configuration have been observed. In this 7-minute video, Don Lincoln talks about the possibility of other types of neutrinos, called right-handed or sterile neutrinos.