Unitarity imposes constraints on scattering amplitudes from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
Unitarity is a fundamental property of quantum mechanics, which states that the total probability of all possible outcomes of a physical process must add up to 1. In the context of scattering amplitudes, unitarity imposes important constraints on the allowed behavior of particles during collisions. When particles interact and scatter off each other, the total probability of all possible scattering outcomes must be conserved. This means that the sum of the probabilities of all possible final states must equal the probability of the initial state. Mathematically, unitarity can be expressed through the unitarity condition, which relates the scattering amplitudes for different processes and ensures that they satisfy the conservation of probability. This condition imposes res...
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