Re: fermions at c, still confussed

Eric Gisse wrote:
Tom Roberts wrote: 
experiments with the ability to observe
the tiny mass differences (<1 eV/c^2) are recent.


Did someone finally put a lower bound on their masses that is larger
than zero?

Neutrino flavor oscillations have been observed in numerous experiments. Combined with Lorentz invariance that implies that the different flavors have different masses, and they can put lower bounds on the squares of the mass differences. All three neutrino flavors (electron, muon, tau) are observed to oscillate among themselves. We don't yet know the actual masses of any flavors of neutrino, but at most one flavor could have zero mass. There is a rich literature on "neutrino oscillations" that has the details.


Tom Roberts	tjroberts@xxxxxxxxxx
.

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