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Photon decay into Electron and Positron

  1. Oct 10, 2012 #1
    1. The problem statement, all variables and given/known data

    Show that the energy momentum conservation forbids the reaction (gamma)-> positron + electron,

    Gamma is a photon, which is chargeless and massless

    2. Relevant equations

    E(photon)=hf
    p(photon)=hf/c
    Conservation of Energy
    Conservation of Momentum
    4-momentum

    3. The attempt at a solution

    My intuition is just to state that a massless and chargeless particle cannot create two particles with mass and charge. Is this correct?
     
  2. jcsd
  3. Oct 10, 2012 #2

    vela

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    Nope.
     
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