A finite-time QFT treatment removes the t-channel singularity that appears when an unstable particle scatters off another particle.
This point of view is based on the solution proposed by Ginzburg [11] and anticipated by Peierls [4]:m 2 C →m 2 C −im CΓC
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Scattering off unstable states
A finite-time QFT treatment removes the t-channel singularity that appears when an unstable particle scatters off another particle.