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Theoretical physicists love symmetries and very few assumptions to describe Nature. For example, people knew there is "some force" that attracts an apple from the tree and there exists "a force" that binds moon to earth. But Newton realized they are the same force and their motions are described by same simple law which is called law of gravity. This is the ...


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Note that rho meson has no strange quark i.e. its strangeness quantum number is zero. Similarly the decay products positive as well as negative pion has no strange quark ie. Strangeness quantum number is zero for decay products too. Thus, strangeness is conserved in this decay process of neutral rho meson. Now note that it is the rule of nature that ...


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In the end, you cannot calculate the pion decay constant in chiral perturbation theory. All you can do is adjust the parameters in your n-loop calculation so that the physical value is reproduced. The standard reference for the one-loop renormalization of ChPTh is Gasser and Leutwyler, Chiral Perturbation Theory to One Loop, Annals of Physics 158, 142 ...



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