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What particle is this?

  1. Sep 17, 2007 #1
    it moves with speed of light. it is a fermion.
  2. jcsd
  3. Sep 17, 2007 #2
  4. Sep 17, 2007 #3


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    But according to "newest" data, neutrinos have mass, and does not travel at speed of light.
  5. Sep 17, 2007 #4
    I was assuming that it is a homework question, so it would probably have been set before the current experimental evidence.
  6. Sep 26, 2007 #5
    I guess, if you are into Rishon Theory, you could say that the "v" Rishon is a massless fermion which would travel at the speed of light. If you think Rishon Theory is plausible, that is...
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