Significant in-medium reduction of the mass of eta' mesons in sqrt(s(NN)) = 200 GeV Au+Au collisions

Abstract

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 were analysed in terms of various models of hadronic abundances. To describe these data, an in-medium ${\eta }^{\prime }$ mass decrease of at least 200 MeV was needed in each case.

Comments: Dedicated to 60th birthday of Miklos Gyulassy. 2 pages, 4 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee