Integrated Concepts

The primary decay mode for the negative pion is $\pi^{- } \rightarrow \mu^{- } + \left(\overset{-}{\nu}\right)_{\mu}$. (a) What is the energy release in MeV in this decay? (b) Using conservation of momentum, how much energy does each of the decay products receive, given the $\pi^{- }$ is at rest when it decays? You may assume the muon antineutrino is massless and has momentum $p = E / c$, just like a photon.