Massive poles in Lee-Wick quantum field theory

Abstract

Most discussions of propagators in Lee-Wick theories focus on the presence of two massive complex conjugate poles in the propagator. We show that there is in fact only one pole near the physical region, or in another representation three pole-like structures with compensating extra poles. The latter modified Lehmann representation is useful caculationally and conceptually only if one includes the resonance structure in the spectral integral.

Comments: 10 pages, 8 figures. Version 2 has an improved drawing of Fig. 3