Abstract
It is shown that when composite bosons result from Fermi couplings between two different pairs of unlike fermions, one can construct an equivalent Yukawa-type theory which postulates at least two boson fields whose renormalization constants are zero. The number of boson fields can be reduced when the Fermi coupling constants fulfil certain relations. To the Fierz group of rearrangement of the fermion pairs, there can be associated a group of Yukawa-type theories which are equivalent, although postulating boson fields of different types.
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