User:Maschen/Dirac–Fierz–Pauli equations - Wikipedia
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Dirac in 1936, and Fierz and Pauli in 1939, built relativistic wave equations from irreducible spinors A and B, symmetric in all indices, for a massive particle of spin n + ½ for integer n (see Van der Waerden notation for the meaning of the dotted indices):
where p is the momentum as a covariant spinor operator. For n = 0, the equations reduce to the coupled Dirac equations and A and B together transform as the original Dirac spinor. Eliminating either A or B shows that A and B each fulfill the Klein–Gordon equation[1]
provided the conditions
hold.