This amounts to considering the scattering process AAB→AABcontainingAC→ACas a subprocess [12–15]

One may consider only stable states in the initial/final states

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hep-ph · 2025-07-03 · conditional · novelty 6.0

A finite-time QFT treatment removes the t-channel singularity that appears when an unstable particle scatters off another particle.

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Scattering off unstable states hep-ph · 2025-07-03 · conditional · none · ref 4
A finite-time QFT treatment removes the t-channel singularity that appears when an unstable particle scatters off another particle.