A ghost-parity-preserving perturbation theory, Z2PT, reproduces old-fashioned perturbation theory for real amplitudes through third order and, when the parity-preserving interaction vanishes, through fourth order, with contact-term differences that leave local primitive UV divergences unchanged.
9.5) and Schwartz (Chap
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Superselected ghost theory: perturbation theory
A ghost-parity-preserving perturbation theory, Z2PT, reproduces old-fashioned perturbation theory for real amplitudes through third order and, when the parity-preserving interaction vanishes, through fourth order, with contact-term differences that leave local primitive UV divergences unchanged.