Abstract
The most general S-matrix for the 30 first generation quarks and leptons shows many features of SU(5) with no symmetry constraints imposed beyond global conservation of electric charge and weak isospin. All helicity-conserving four-point amplitudes conserve baryon number if there are no transitions from uR or uL quarks to other states and must violate B conservation if such transitions occur. B - L conservation is violated in four-point functions only in single-helicity-flip amplitudes.
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