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I can't find a good answer(if there is) to my question.

When in statistical mechanics we can define the order parameter for to study some phase transition. we need to define a order parameter.

Now, I want to know if we can to define/find some "order parameter" for to study the phase transition in a Gauge Theory, for example, in QCD, which is a Gauge Theory and there we have different phase transition.

Then, a Order Parameter in a Gauge Theory: Can we find/define one in a Gauge Theory(like QCD)???

I hope some comment.

Thank you!

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# Order Parameter in a Gauge Theory, Can we find one in a Gauge Theory(like QCD)?

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