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

被引：0

作者：

Vertesi, Robert ^{[1
]}

Csoergo, Tamas ^{[1
]}

Sziklai, Janos ^{[1
]}

机构：

[1] MTA KFKI RMKI, H-1525 Budapest 114, Hungary

来源：

HCBM 2010 - INTERNATIONAL WORKSHOP ON HOT AND COLD BARYONIC MATTER | 2011年 / 13卷

关键词：

HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; BOSE-EINSTEIN CORRELATIONS; MODEL; RESTORATION; MATTER;

D O I：

10.1051/epjconf/20111304004

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A reduction of the mass of the eta' (958) meson may indicate the restoration of the U-A(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 root s(NN) = 200 GeV Au+Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, an in-medium eta' 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.

引用

页数：6

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