A series of possible particle processes are listed below. Which (if any) are probably not processes mediated by the weak interaction? (Note: $\gamma=$ a photon, $\mu=$ a muon, which is a lepton like the electron but heavier. Don't worry about conservation of energy.)
A) $n+e^{+} \rightarrow p^{+}+\bar{v}$
B) $v+n \rightarrow p^{+}+\mu^{-}$
C) $\bar{v}+p^{+} \rightarrow n+e^{+}$
D) $e^{+}+e^{-} \rightarrow \gamma+\gamma$
E) All might be weak processes.

Question

Quizplus · Accepted Answer

The process $e^{+}+e^{-} \rightarrow \gamma+\gamma$ involves the annihilation of an electron and a positron to produce two photons. This is an electromagnetic process, not a weak interaction process. The weak force typically involves neutrinos or changes in quark flavor, not the direct production of photons from lepton annihilation.

A Series of Possible Particle Processes Are Listed Below γ=\gamma=γ= A Photon

A Series of Possible Particle Processes Are Listed Below $\gamma=$ A Photon