Doubt cast on theorized ‘sterile’ particles leaves a neutrino mystery unsolved
A highly reclusive variety of the lightweight subatomic particles seems less likely
![a metallic walkway in the MicroBooNE detector under construction](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/10/102621_EC_no-new-neutrinos_feat.jpg?fit=1030%2C580&ssl=1)
The MicroBooNE detector (shown under construction) observes particles produced when neutrinos interact inside. It has found no sign of stealthy particles called sterile neutrinos, despite hints seen in earlier experiments.
Reidar Hahn