Supersymmetry and String Theory

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"Tree-level" in the context of supersymmetry and string theory refers to Feynman diagrams that do not contain loops, representing the simplest interactions in perturbation theory. This concept is crucial as it indicates calculations at the 0th order, which simplifies complex quantum field theories. The term is often used in discussions about particle interactions and their theoretical underpinnings. Understanding tree-level diagrams is essential for grasping more advanced topics in quantum physics. The discussion highlights the foundational role of tree-level calculations in theoretical physics.
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I am reading Michael Hines new book, Supersymmetry and String Theory. He keeps referring to "tree-level". What is this?
 
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"Tree-level" refers to Feynman diagrams with no loops. That is, 0th order in perturbation theory (h-bar).
 

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