Indirect Observation of an In-Medium η′ Mass Reduction in √SNN=200 GeV Au + Au Collisions

被引：55

作者：

Csoergo, T. ^{[1
,2
]}

Vertesi, R. ^{[2
]}

Sziklai, J. ^{[2
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] MTA KFKI RMKI, H-1525 Budapest, Hungary

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 18期

关键词：

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

D O I：

10.1103/PhysRevLett.105.182301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

PHENIX Collaboration and STAR Collaboration data on the intercept parameter of the two-pion Bose-Einstein correlation functions in root(S)(NN) = 200 GeV Au + Au collisions are analyzed in terms of different models of hadronic multiplicities. To describe this combined PHENIX and STAR data set, an in-medium eta' mass reduction of at least 200 MeV is needed, at the 99.9% confidence level in the considered model class. Such a significant eta' mass modification may indicate the restoration of the U-A(1) symmetry in a hot and dense hadronic matter and the return of the 9th "prodigal'' Goldstone boson.

引用

页数：4

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