The muon decays according to ${\mu }^{-}\to e^{-}+\overline{{\nu }_e}+{\nu }_{\mu }$. A Feynman diagram for this decay is shown below.

Identify the three unlabelled particles in the diagram.

 

The muon decays according to ${\mu }^{-}\to e^{-}+\overline{{\nu }_e}+{\nu }_{\mu }$. A Feynman diagram for this decay is shown below.

Use the above diagram to construct a new Feynman diagram representing the scattering of electron anti-neutrino off a muon.

Write down the reaction equation representing the decay ${\mu }^{+}$, which is anti-particle of the ${\mu }^{-}$.

The interaction responsible for the decay of the muon has a very short range. State the property of the exchange particle that is responsible for the short range.