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Quasi-Unitary Three-Particle Approximations
Phys. Rev. 188, 2235 – Published 25 December, 1969Erratum Phys. Rev. D 2, 812 (1970)
DOI: https://doi.org/10.1103/PhysRev.188.2235
Abstract
The three-particle discontinuity equations are expressed in forms convenient for the study of unitarity violations. As an application, the constraints on the two-particle transition operators imposed by requiring consistency with three-particle unitarity are deduced. This provides a framework for some recent proposals for generating approximate, finite-rank, two-particle transition operators which do not satisfy off-shell unitarity. Also, the general features of some quasi-unitary impulse approximations are discussed in a unified fashion in order to clarify the conditions for their validity as well as for higher-order quasi-unitary approximations.
Erratum
Quasiunitary Three-Particle Approximations
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