Decades of weird experimental results appeared to support the existence of the sterile neutrino, a hypothetical particle that would solve multiple mysteries. But recent experiments have killed hope of finding these phantoms, leaving physicists to wonder what might explain their anomalies. <p>The post <a href="https://www.quantamagazine.org/experiments-ring-the-death-knell-for-sterile-neutrinos-20260408/" target="_blank">Experiments Ring the ‘Death Knell’ for Sterile Neutrinos</a> first appeared on <a href="https://www.quantamagazine.org" target="_blank">Quanta Magazine</a></p>
Neutrinos have about as little influence as a particle can have. They have essentially no heft, no electric charge, and no “color” charge. As a result, the neutrino has no connection with most of nature’s forces; it can slip through whole planets and stars without striking a single atom. But neutrinos have proven more than capable of bending the life path of a scientist. In the late 1990s…
Sterile neutrinos are a hypothetical type of neutrino that do not interact via the standard weak interactions, making them difficult to detect. They are proposed to help explain various anomalies in particle physics, including discrepancies in neutrino oscillation experiments.
Neutrino oscillation is a quantum phenomenon where a neutrino changes its flavor as it travels through space. This process indicates that neutrinos have mass, which was a surprising discovery that challenged previous assumptions in particle physics.