A Measurement from Feynman diagram

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Feynman diagrams serve as graphical representations of mathematical expressions rather than direct measurement tools. Measurements such as branching ratios and cross-sections cannot be extracted directly from these diagrams. To obtain physical quantities, one must perform calculations based on the underlying mathematical framework. The discussion emphasizes the importance of understanding the mathematical context behind Feynman diagrams. Ultimately, Feynman diagrams are a visual aid, not a measurement technique.
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different calculations from Feynman diagram
hi, can anyone please give me the list of measurement we can do ON Feynman diagram?
Like , branching ratio, cross-section etc
 
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Those are not measurements you do on Feynman diagrams. Feynman diagrams are not for measuring things, they are graphical representations of terms of a mathematical expression. In order to conclude this from them you need to do the math.
 
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