Ad. Dutra et Cp. Natividade, CONSISTENT HIGHER-DERIVATIVE QUANTUM-FIELD THEORY - A MODEL WITHOUT TACHYONS AND GHOSTS, Modern physics letters A, 11(10), 1996, pp. 775-783
We present a higher derivative gauge theory in (2 + 1) dimensions whic
h can have its parameters suitably tuned in order to become a consiste
nt quantum field theory, in the sense that both tachyons and ghosts ar
e absent from the particle spectrum of the theory.