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A reduction of the mass of the eta'(958) meson may signal restoration of theU_A(1) symmetry in a hot and dense hadronic matter, corresponding to the returnof the 9th, "prodigal" Goldstone boson. We report on an analysis of a combinedPHENIX and STAR data set on the intercept parameter of the two-pionBose-Einstein correlation functions, as measuremed in sqrt(s(NN)) = 200 GeV Au+ Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, anin-medium eta' mass reduction of at least 200 MeV is needed, at the 99.9 %confidence level in a broad model class of resonance abundances.

U_A(1) Symmetry Restoration from an In-Medium eta' Mass Reduction in sqrt(s(NN)) = 200 GeV Au+Au Collisions