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Particle decay/Four momenta

  1. Mar 26, 2015 #1
    • Member warned about posting with no effort
    1. The problem statement, all variables and given/known data
    A particle of unknown rest mass, M, travelling at an unknown speed, v, decays to an electron, a positron and a photon with the following four-momenta: pe x pe y pe z Ee/c pp x pp y pp z Ep/c pγ x pγ y pγ z Eγ/c
    Write down an expression for M in terms of these four-momenta. These four momenta are measured in a detector (in units of GeV/c) to be, respectively,: 0 50 0 50 , 0 −50 0 50 , 0 0 100 100 where the mass of the electron is neglected.

    2. Relevant equations
    Calculate M and v.

    3. The attempt at a solution
     
  2. jcsd
  3. Mar 27, 2015 #2

    PeterDonis

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    2016 Award

    Staff: Mentor

    Chris T, you need to make some attempt at a solution. To start, you might think about what equations would be relevant. Is there an equation that relates the energy and momentum of a particle with a given rest mass?
     
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