Chiral multiplets of hadron currents

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Abstract
Using group theoretical methods, we enumerate possible chiral representations in which hadron interpolating currents can be classified. We give simple examples of currents in each representation, some of which are well known. The classification enables one to find relations among current vacuum correlators in a chirally and/or axial U(1) symmetric phase of QCD in a straightforward way. In addition to recovering many well-known relations among two-point correlation functions, a number of novel relations are found.
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