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Homework Help: Electron to Stationary Proton Collision

  1. Dec 5, 2016 #1
    1. The problem statement, all variables and given/known data
    A 2 GeV electron is incident on proton (m_p * C^2 = 0.938 GeV) target at rest. Calculate the invariant mass of the electron-proton pair in the Center of Mass(CM) frame. Neglect the mass of electron which is much less than the proton mass.

    2. Relevant equations
    M = [P1 + P2)][/2]
    M = gamma([m][/0])
    3. The attempt at a solution

    My first attempt was to calculate the mass through the second equation in relevant equations but I don't think that was correct. Because it went like this:

    M = ([m][/0])/sqrt(1-(([v][/2])/[c][/2]) but I don't think that is necessarily the right step forward.
    Any help would be much appreciated!
  2. jcsd
  3. Dec 6, 2016 #2


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    Can you elaborate on your attempt? I don't see what it has to do with any of the information given in the problem.
  4. Dec 6, 2016 #3
    Since posting this question I have realized that I must use the equation m^2=E^2-p^2 but I'm not really sure how to progress through the problem.
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