From: tjroberts137@sbcglobal.net   
      
   On 3/26/20 12:44 AM, raymond.yohros@gmail.com wrote:   
   > Why then can we not determine what % of the speed of light   
   > the [neutrinos] where traveling at and with some algebra as usual   
   > determine their masses as well?   
      
   The resolution in measuring their speed is too poor to distinguish it   
   from c, by many orders of magnitude. So their mass cannot be determined   
   from their speed. And as the moderator mentioned, one would also need to   
   know the energy of the neutrinos.   
      
   Also, KATRIN did not actually measure the mass of the electron neutrino,   
   they only put an upper limit of 1.1 eV on it. They may be able to reduce   
   that somewhat, but it is a very challenging measurement.   
      
   Note that neutrino oscillation measurements imply nonzero but much   
   smaller mass differences between the different neutrino mass   
   eigenstates; they cannot determine the mass of any of them.   
      
   Tom Roberts   
      
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