In Quantum Field Theory, scattering amplitudes involving plane waves require regularization via finite volume normalization to resolve divergences arising from non-normalizable states. The physical interpretation is derived by transitioning to box normalization and taking limits where regulators vanish upon asking questions regarding probability per unit time or flux, ensuring Lorentz-invariant results for differential cross-sections. This mechanism demonstrates how kinematic factors dominate scattering probabilities in the center-of-mass frame, governing phenomena such as particle lifetime dilation and neutron moderation rates independent of dynamical interaction details.
In Quantum Field Theory, scattering amplitudes involving plane waves require regularization via finite volume normalization to resolve divergences arising from non-normalizable states. The physical i…