https://phys.org/news/2021-11-physicists-neutrinos-large-hadron-collider.html
https://en.wikipedia.org/wiki/Neutrino
A neutrino (/nuːˈtriːnoʊ/ or /njuːˈtriːnoʊ/) (denoted by the Greek letter ν) is a fermion (an elementary particle with spin of 1/2) that interacts only via the weak interaction and gravity.[2][3] The neutrino is so named because it is electrically neutral and because its rest mass is so small (-ino) that it was long thought to be zero. The rest mass of the neutrino is much smaller than that of the other known elementary particles excluding massless particles.[1] The weak force has a very short range, the gravitational interaction is extremely weak, and neutrinos do not participate in the strong interaction.[4]Thus, neutrinos typically pass through normal matter unimpeded and undetected.[2][3]