In the case of N ∗πscattering, when the neutron is considered as the exchanged particle, the infinity is cured by the fact that the neutron has a nonzero width

The exchanged particleBhas a finite width because it is not really stable:m 2 B →m 2 B −im BΓB

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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 2
A finite-time QFT treatment removes the t-channel singularity that appears when an unstable particle scatters off another particle.