sterile neutrino

The MINOS+ collaboration at Fermilab collected data with a medium-energy neutrino beam from September 2013 to June 2016. The collaboration has exploited the data to set more stringent boundaries on the possibility of sterile neutrinos mixing with muon neutrinos.

From CERN Courier, March 8, 2019: Newly published results from the MINOS+ experiment at Fermilab cast fresh doubts on the existence of the sterile neutrino — a hypothetical fourth neutrino flavor that would constitute physics beyond the Standard Model. MINOS+ studies how muon neutrinos oscillate into other neutrino flavors as a function of distance travelled.

From New Scientist, Nov. 21, 2018: Elusive though it is, the sterile neutrino would be a real boon. It could make sense of experimental anomalies stretching back decades, and give us the first confirmed glimpse of physics beyond what we know. Subscription required.

From Cosmos, Nov. 28, 2018: MiniBooNE researchers have published a paper in the journal Physical Review Letters, reporting a possible trace of a fourth neutrino, an addition to the three of the Standard Model.