Lepton Number as the Fourth Color

@article{Pati1974LeptonNA,
  title={Lepton Number as the Fourth Color},
  author={Jogesh C. Pati and A. Salam},
  journal={Physical Review D},
  year={1974},
  volume={10},
  pages={275-289}
}
Universal strong, weak, and electromagnetic interactions of leptons and hadrons are generated by gauging a non-Abelian renormalizable anomaly-free subgroup of the fundamental symmetry structure $\mathrm{SU}{(4)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(4)}_{R}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}({4}^{\ensuremath{'}})$, which unites three quartets of "colored" baryonic quarks and the quartet of known leptons into 16-folds of chiral fermionic multiplets, with lepton number… 

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~Note that strong-interaction quark-quark scattering amplitudes arising due to V(8) exchange are of order (f 2/f 2c ) — (1/c2)
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Of course, if one could leave 6', ~, quarks massless [a possibility which is attractive for chiral SU(2}I & SU(2)R symmetry], the &p&6X& interaction would be p5-invariant
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we mean U or linear combinations of U and Vo depending upon the complexion of the physical particles (see footnote 20)
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