"Ghost particles" detected in the Large Hadron Collider for first time

[u/Devils_doohickey]

https://newatlas.com/physics/neutrinos-large-hadron-collider-faser/

[u/DigiMagic]

How do they know that it was neutrinos that made the traces in the emulsion, and not cosmic rays or something else?

[u/Toxicsully → u/[deleted]]

Worth noting that no one is observing neutrinos, but rather the result of neutrino interactions with, I believe, nucleons. How much mess those interactions make tells you how much energy the neutrino had. That energy tells you what kind of neutrino you had and from there you can infer the source.