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PGaccount
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tree level diagrams are classical, and loops are corrections of order h. what is a good derivation or explanation of this?
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Loops in tree level diagrams represent virtual particles that are exchanged between the particles in the diagram. These virtual particles contribute to the overall interaction and can affect the properties of the particles involved.
Loops are considered as O(h) corrections because they introduce higher-order terms in the calculation of the interaction amplitude. These terms are proportional to the coupling constant h, which represents the strength of the interaction.
Loops can significantly affect the accuracy of tree level diagrams by introducing higher-order corrections that can change the predicted values of physical observables. These corrections must be taken into account in order to accurately describe experimental results.
No, loops cannot be neglected in tree level diagrams as they play a crucial role in determining the properties and interactions of particles. Neglecting loops can lead to incorrect predictions and inaccurate descriptions of physical phenomena.
Yes, there are limitations to the use of loops in tree level diagrams. These limitations arise from the fact that loop calculations can become increasingly complex and difficult to perform as the number of particles and interactions involved in the diagram increases. In some cases, alternative methods must be used to calculate loop corrections.