Speaker
Mr
Robert Vertesi
(MTA KFKI RMKI)
Description
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
are analyzed in terms of six different models of hadronic multiplicities.
To describe this combined PHENIX and STAR dataset, an in-medium $\eta^\prime$ mass reduction of at least 200 MeV is needed, at the 99.9 \% confidence level, in the considered model class.
The best description is achieved with an $\eta^\prime$ mass that is reduced from the 958 MeV vacuum value to an in-medium value of
$m^*_{\etap} = 340{+50\atop -60}$(statistics) ${+280\atop -140}$ (model) $\pm{42}$ (systematics) MeV. The system size, energy and centrality dependence of this $\eta^\prime$ mass reduction is also investigated and estimate is given on its extent.
Primary authors
Mr
Janos Sziklai
(MTA KFKI RMKI)
Mr
Robert Vertesi
(MTA KFKI RMKI)
Mr
Tamas Csorgo
(MTA KFKI RMKI, Harvard University)
