Discriminating between effective theories of UA(1) symmetry breaking
Abstract
We address the question if one can empirically distinguish between the two proposed solutions to the ``UA (1) problem'': the 't Hooft, and the Veneziano-Witten UA(1) symmetry breaking effective interactions. Two hadronic observables are offered as discriminants: (1) The scalar (0+) meson spectrum; (2) Weinberg's second spectral sum rule. Their present experimental status is discussed.
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