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How to detect nteraction between two massless particles?

  1. Jul 25, 2010 #1
    What equipment one can use to detect interaction between two massless particles, such a photons? Is that even possible?
    If it is possible, I guess the only thing that one will be able to measure is the difference in energy between particles.
  2. jcsd
  3. Jul 26, 2010 #2


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    Science Advisor

    Photon-photon scattering is an extremely weak effect.
    Look up "Delbruck scattering"...
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