Why is the particle process (e-) + (e+) → W+ not possible?
Change needs to be conserved at each vertex.. so vertex doesn’t exist
-
-
Not only that.. the process can’t even be induced at loop level since it’s at each vertex where charge is conserved
-
This comes down to QED being a U(1) gauge theory, which implies a globally conserved charge.. and since all of our operators are gauge invariant we must have that the "vertices" representing those operators obey that too
- 4 more replies
New conversation -
-
-
But you can get W+ W-, no?
-
Yes, I believe that could be mediated by the photon at tree level
End of conversation
New conversation -
-
-
Change is never conserved. It generates spontaneously in your pocket from only a few starter coins.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.