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arXiv · 1102.0785

In-medium reduction of the η' mass in \sqrt{s_NN} = 200 GeV Au+Au collisions

Robert Vertesi·Tamas Csorgo·Janos Sziklai
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Abstract

A reduction of the mass of the η'(958) meson may indicate the restoration of the UA(1) symmetry in a hot and dense hadronic matter, corresponding to the return of the 9th, "prodigal" Goldstone boson. We report on an analysis of a combined PHENIX and STAR data set on the intercept parameter of the two-pion Bose-Einstein correlation functions, as measuremed in \sqrt{s_NN} = 200 GeV Au+Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, an in-medium η' mass reduction of at least 200 MeV is needed, at the 99.9 % confidence level in a broad model class of resonance multiplicities. Energy, system size and centrality dependence of the observed effect is also discussed.

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Robert Vertesi, Tamas Csorgo, Janos Sziklai. 2011-02-03. In-medium reduction of the η' mass in \sqrt{s_NN} = 200 GeV Au+Au collisions. https://doi.org/10.1051/epjconf%2F20111304004

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