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Why do we exclude the quark condensate in the OPE?

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In every QCD paper I open people say that in the OPE, the lowest order non-trivial condensate is the gluon condensate, whose dimensions are 4. Nonetheless, I knowof the existence of the quark condensate, whose dimensions are 3. Why is this one excluded?

asked Apr 15, 2016 in Theoretical Physics by Dmitry hand me the Kalashnikov (735 points) [ no revision ]

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