A pion (mass 0 140 GeV c2) at rest decays by the weak interaction into a muon of mass 0 106 GeV c2 and a muon antineutrino v Ignoring the rest energy of the antineutrino, what is the total kinetic energy of the muon and the antineutrino

Question: A pion (mass 0.140 GeV/ c2) at rest decays by the weak interaction into a muon of mass 0.106 GeV/ c2 and a muon antineutrino:

A pion (mass 0.140 GeV/ c2) at rest decays by the weak interaction into a muon of mass 0.106 GeV/ c2 and a muon antineutrino: π− → μ− + vμ. Ignoring the rest energy of the antineutrino, what is the total kinetic energy of the muon and the antineutrino?

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