In the rest frame of a particle of mass M, decaying into 2 particles with masses m1 and m2, show that E1/c2 = M2=m22+m12/ 2M and |p1|/c = (AB)1/2 / M, where A = M2 - (m1 + m2)2; B = M2 -(m1 - m2)2

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In the rest frame of a particle of mass M, decaying into 2 particles with masses m1 and m2, show that

E1/c= M2=m22+m12/ 2M


and

|p1|/c = (AB)1/2 / M, where A = M2 - (m1 + m2)2; B = M-(m1 - m2)2

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