On Thursday, March 26, 2020 at 1:53:33 PM UTC-5, Phillip Helbig (undress to   
   reply) wrote:   
   > In article <0013b48a-26fc-4b7c-ade4-a70929efa9a7@googlegroups.com>,   
   >  writes:   
   >   
   > > Why then can we not determine what % of the speed of light   
   > > the particles where traveling at and with some algebra as usual   
   > > determine their masses as well?   
   >   
   > Note that neutrinos from the supernova 1987A in the Large Magellanic   
   > Cloud emitted neutrinos which were detected on Earth.  Since the   
   > difference in emission times of light and neutrinos is only about 3   
   > hours, this is negligible for the travel time of 157,000 years and thus   
   > provides a good lower limit on the speed of neutrinos (i.e. very close   
   > to the speed of light).  This gives an upper limit on the mass of the   
   > electron neutrino of about 26 eV.  Current limits are about 0.11 eV.   
   > However, because of neutrino oscillations, we know that it is non-zero.   
   >   
      
   Can it be possible that the mass of an electron neutrino   
   Is never the same?, unlike dirac particles.   
      
   that the 3 different flavors are simply 3 different ranges in which   
   the mass of the neutrino may be? But not a fixed value, like a photon   
   or electron? Or even c? (the probability mass range distribution.)   
      
   if there masses oscillates, that already means they move at variable speeds!   
      
   is a neutrinoless double beta decay observation the only way to conclude   
   that we are talking of mayorana particles?   
      
   r.y   
      
   [[Mod. note -- I believe that we know there are (at least) 3 mass   
   eigenstates which are stable (they do not oscillate); the 3 known   
   neutrino flavors are mixtures of these mass eigenstates.   
   -- jt]]   
      
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