Question: (a) A stationary particle 1 decays into particles 2 and 3, which move off with equal but oppositely directed momenta. Show that the kinetic energy

(a) A stationary particle 1 decays into particles 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 (+ (rest energy 139.6 MeV) can decay to an antimuon (+ (rest energy 105.7 MeV) and a neutrino n (rest energy approximately 0).What is the resulting kinetic energy of the antimuon?

-[(E, - E)? - E, 2E1 K2

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