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.
|Journal||EPJ Web of Conferences|
|Publication status||Published - Dec 1 2012|
|Event||International Workshop on Hot and Cold Baryonic Matter, HCBM 2010 - Budapest, Hungary|
Duration: Aug 15 2010 → Aug 20 2010
ASJC Scopus subject areas
- Physics and Astronomy(all)