The ${cal M}_{if}$ that appears in the Feynman diagrams - Are they probability ranges?
Physics Asked on March 11, 2021
${cal M}_{if}$ are probability amplitudes? This right here
that this on top of each diagram, Why is it you cancel my questions that I asked anything special this is not cool I just wanted a help and so all the time canceling my questions, if someone has available can answer my Doubt?
One Answer
They are probability amplitudes, not probability ranges. They are also called “matrix elements”. They are complex numbers, and their squared magnitudes are related to the probability that the initial state $i$ in the Feynman diagram becomes the final state $f$.
Answered by G. Smith on March 11, 2021
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