Re: fermions at c, still confussed

Heckuva Job wrote:
PD wrote: 
Neutrinos (up until recently) were completely
compatible with being massless fermions.

so they have mass now?

They always did. It's just that experiments with the ability to observe the tiny mass differences (<1 eV/c^2) are recent.


in many books bosons are massless

Then you need to read better books. The W and Z bosons have masses >80 times that of a proton. There could well be others....


so a mass particle could approach c involving a finite amount of
energy?

Yes. In Fermilab's tevatron, the protons travel about 0.9999994 c relative to the ground. That is 800 GeV in kinetic energy, which is extremely tiny on a human scale (think: the energy expended by a flea doing a pushup (:-)).


is it not against relativity? 

No, this is fully consistent with SR.


Tom Roberts	tjroberts@xxxxxxxxxx
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