In-medium reduction of the η′ mass √sNN = 200 GeV Au+Au collisions

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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 psNN = 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.

Original languageEnglish
Article number04004
JournalEPJ Web of Conferences
Publication statusPublished - Dec 1 2012
EventInternational Workshop on Hot and Cold Baryonic Matter, HCBM 2010 - Budapest, Hungary
Duration: Aug 15 2010Aug 20 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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