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Good stuff! Do you think the classical lagrangian is unique? Or that it depends on how you take the classical limit?
I think what Sean is saying is that the Classical theory *is* the QCD lagrangian at tree level
"Tree level" as in "to forget the forest?" Or is "tree" another term of art?
It’s a very very technical term heh, free level Feynman diagrams are the leading order terms in perturbation theory
so when everything is weakly coupled (as he said), everything is well defined and we can calculate the observables using tree level interactions of Yang Mills, just as we can with QED at tree level as well.. it's just that the theory breaks down at ~.1GeV
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