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Homework Help: Particle Decay/4-Momenta Homework Help

  1. Apr 29, 2013 #1
    Im stuck on the first question of one of my homework sheets. Partly due to me being horrific at particle physics and lack of sleep (yay exam period) i just can't figure out whats happening and just been staring at it for an hour.

    Sheet: https://docs.google.com/file/d/0B6FGt5Eo0GHUdmpMbnhsVlU1QzA/edit

    Starting with question 1.

    If you re arrange (2) you can get

    wx^2 = -Q^2 +mp^2 + 2mpv.

    Using M = E - K

    I can then go to

    Wx^2 = -Q^2 + mp^2 + 2v(Ep-Kp)

    This is where i hit a wall as it wants me to show

    Wx^2 = -Q^2 + m^2 + Ep (E-E') -2kp(k=k')

    it then asks me to use (2) again but i already sued that trying to get to the above.

    TL;DR Im confused ;(
  2. jcsd
  3. Apr 29, 2013 #2


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    2017 Award

    Staff: Mentor

    You can use the same equation more than once, if you like.
    Anyway: You need some expression for v. Can you calculate this energy transfer in terms of the energies and momenta given in the problem? What is the energy before the collision, and afterwards?
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