What is the Fermion Moving at Light Speed?

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it moves with speed of light. it is a fermion.
 
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(Anti-)neutrinos
 
But according to "newest" data, neutrinos have mass, and does not travel at speed of light.
 
I was assuming that it is a homework question, so it would probably have been set before the current experimental evidence.
 
iamquantized said:
it moves with speed of light. it is a fermion.

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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I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
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