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Could anybody help me?

My wondering seems so trivial, but I can't skip it.

They say that since u and d quarks are much lighter than QCD scale(~200MeV), in reality we can consider the QCD Lagrangian has an approximate global chiral symmetry with respect to these two flavors. At first, it sounded plausible, but now I wonder what relation between the QCD scale and the quark masses there is and how. Is this problem related to the renormalization scale?

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# I QCD scale and massless limit of u & d quarks

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