Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-12-30
Phys.Rev.Lett.105:182301,2010
Physics
Nuclear Physics
Nuclear Experiment
11 pages and 3 figures, version accepted for a publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.105.182301
PHENIX and STAR data on the intercept parameter of the two-pion Bose-Einstein correlation functions in sqrt(s_{NN}) = 200 GeV Au+Au collisions are analyzed in terms of different models of hadronic multiplicities. To describe this combined PHENIX and STAR dataset, an in-medium eta' mass reduction of at least 200 MeV is needed, at the 99.9 % confidence level in the considered model class. Such a significant eta' mass modification may indicate the restoration of the U_A(1) symmetry in a hot and dense hadronic matter and the return of the 9th "prodigal" Goldstone boson.
Csorgo Tamas
Sziklai Janos
Vértesi Robert
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