pion138pion, muon, neutrino A pion (mπ = 273 me) at rest decays into a muon (mμ = 207 me) and a neutrino (mν = 0).Find the kinetic energy and momentum of the muon and the neutrino inpion138love.click is your first and best source for all of the information you're looking for. From general topics to more of what you would expect to find