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.
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页数：4
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