Photon-Photon Scattering

  • #1
Why do particles scatter in particle-particle collision while photons don't in photon-photon collisions, assuming that photons don't have enough energy to create particle anti-particle pairs?
 

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  • #2
BvU
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What force would do the scattering ?
 
  • #3
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ie.. they have no mass
 
  • #4
jtbell
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Why do particles scatter in particle-particle collision while photons don't in photon-photon collisions,
Photons can in fact scatter off each other "indirectly", via intermediate virtual electron-positron pairs. See e.g. page 4 (problem 3) of this document:

http://faculty.ucmerced.edu/dkiley/Physics161Fall2011HW2solns.pdf

The cross-section (i.e. the probability) is very small because the Feynman diagram has four vertices as opposed to only two in electron-electron scattering.
 
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  • #5
I have very little knowledge of QED, but can you tell me what dictates exchange of bosons (particle-particle interaction) or electrons (in case of photon-photon interaction) in scattering processes? It will be helpful if you provide some links to further illustrate the point.
 

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