(a) A stationary particle 1 decays into parties 2 and 3, which move off with equal but oppositely directed momenta. Show that the kinetic energy K2 of particle 2 is given by
where E1, E2, and E3 are the rest energies of the particles.
(b) A stationary positive pion π+ (rest energy 139.6 MeV) can decay to an antimuon μ+ (rest energy 105.7 MeV) and a neutrino v (rest energy approximately 0). What is the resulting kinetic energy of the antimuon?
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