Two separate collaborations involving Indiana University scientists have reported new results suggesting unexpected differences between neutrinos and their antiparticle brethren. These results could set the stage for what one IU physicist calls a "radical modification of our understanding of particle physics."
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"The particle-antiparticle symmetry is built into the Dirac square root equation from the Klein-Gordon equation. Anti-particles are the negative energy solutions basically from the mass-shell condition
E =+- [(pc)^2 + (mc^2)^2]^1/2
same "m" a negative energy particle moving backward in time is same as a positive energy anti-particle moving forward in time. We also need the discrete CPT symmetry - it get's tricky why the "m" of the anti-particle is not the "m" of the particle - the "m" for leptons and quarks comes from the Higgs-Goldstone post-inflation vacuum superconductor (see Frank Wilzcek's "Lightness of Being")" -- Jack Sarfatti