Sterile neutrino constraints (summary of results) Constraints on sterile neutrinos come from an amazingly wide range of different sources. From astrophysical observations (review1, review2) to particle physics experiments (MiniBooNE, Daya Bay, LSND, MINOS)
I have been reading about the astrophysical observations (e.g. XMM-Newton), but they rarely go much into detail about the constraints and searches for sterile neutrinos via experiments.
Having little experience in particle physics, I would truly appreciate it if someone could document here, in a sentence or two, what each experiment attempts to constrain, and how.
 A: First of all, one should distinguish the mass scale of the sterile neutrino. This review talks a lot about the keV sterile neutrino and even heavier cases, that however are not very interesting from the point of view of neutrino oscillations, because their mixing is typically very small. The keV sterile neutrino has possible implications as a dark matter candidate and to explain some astrophysical measurements, however.
A different case is the one of the "light sterile neutrino", with a mass around 1 eV, that could explain the so-called Short BaseLine (SBL) anomalies, which include the results of LSND, MiniBooNE and others.
To finally verify the existence of this light sterile neutrino, there are currently ongoing dedicated experiments such as NEOS and DANSS, while many others are planned or under development. It would be very hard to resume here all the experiments and the details, but I think you should be able to find most of the significant information on the light sterile neutrino in the following papers:


*

*a review on theory and constraints from neutrino oscillations, beta and neutrinoless double beta decay and cosmology;

*the most recent global fit that considers the constraints on the light sterile neutrino;

*another interesting comparison of NEOS, DANSS and Daya Bay results.

