Speaker
Mr
Robert Vertesi
(MTA KFKI RMKI)
Description
It is argued that the $\mathrm{U_A}(1)$ or chiral symmetry may temporarily be restored in a hot and dense medium that is created in high energy heavy ion collisions. As a consequence, the mass of the $\eta\prime$(958) mesons may be reduced to its quark model value, and the abundancy of the $\eta\prime$ mesons at low $p_T$ may be significantly enhanced.
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 reduction of at least 200 MeV was needed in each case [1].
[1] http://arxiv.org/abs/0905.2803
Authors
Dr
Janos Sziklai
(MTA KFKI RMKI)
Mr
Robert Vertesi
(MTA KFKI RMKI)
Prof.
Tamas Csorgo
(MTA KFKI RMKI)
