- #1
kelly0303
- 561
- 33
Hello! How was the tau massed measured for the first time? I read that tau was discovered by ##e^+e^-## collisions and they looked for an excess of of end products containing an electron, a muon and some missing energy (coming from the decay the 2 resulting tau's). But the missing energy would come from 4 neutrinos, so you would have a lot of uncertainty in predicting the mass of tay just by measuring the energy of the produced electron and muon. How did they do it? Thanks!