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Homework Help: Relatavistic Decay

  1. Jan 16, 2010 #1
    1. The problem statement, all variables and given/known data

    http://i45.tinypic.com/2it0cpy.jpg

    2. Relevant equations



    3. The attempt at a solution

    momentum before is gamma*pionmass*0.93c
    momentum after is gamma(u)*mass(u)*velocity(u) - E/c where E=pc which is the energy of massless particles

    energy before is gamma*pionmass*c*c
    energy after is gamma*mass(u)*c*c + pc

    just wondering if what ive done above is correct as ive tried to do it that way and i get a really ridiculous answer. Any help is appreciated

    btw the answer is (masspion)^2 + (mass(u)^2)/ 2(masspion).. anyone know how they got to that, its 110 MeV, after some extreme calculation i got 103.75 MeV but i dont know how they got it simply by doing a simple calculation as above
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  2. jcsd
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