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How to understand the smallness of mass while the mass parameter diverge rapidly in renormalization group flow because the mass term in Lagrangian is the relevant operator.By the way,are there always exist the fix point of renormalization group flow in any QTF Theory,or in some theory this point does not exist?

Thank you very much for any instruction.

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# How to explain the smallness of mass while the mass parameter diverge rapidly in ?

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