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Homework Help: Conservation of Four-Momentum Muon decay

  1. Dec 12, 2011 #1
    1. The problem statement, all variables and given/known data
    Muon with mass 80m is at rest. Muon decays into photon and particle Qm. The photon has an energy of E=60m in the +x direction. Find all of the other components.


    2. Relevant equations
    Vx= Px/E
    m^2=E^2-P^2
    Pt=E

    Ignoring the Y and Z components of the Four-Momentum as they are always 0



    3. The attempt at a solution
    [80m,0]=[E,Px] + [E2,P2x]

    Vx=Px/E
    Px=(Vx)(E)
    Px=(1)(E) or Px=(-1)(E)

    Couldn't figure out if the photon itself moved in the +x direction or if just the energy was positive and the particle Qm would move in the +x direction. Can figure out the rest from there the sign just messes me up.

    Thanks
     
  2. jcsd
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