- #1
genloz
- 76
- 1
Is there an ultimate rule that can tell you what to check for to see if a reaction is allowed? I'm quite confused about what to check for in each situation? Is lepton number always conserved? How do you know whether there's enough energy to produce a given mass (eg e+e- -> tau+tau- isn't allowed due to mass conservation but how do you know how much energy is released when a particle and its antiparticle annihilate?) There seems to be too many things to check for which aren't organised logically and simplistically anywhere...