System-size and energy dependences of dielectron excess invariant mass spectra at STAR

被引：2
|
作者：
Yang, Shuai [1 ]
机构：
[1] Univ Sci & Technol China, Hefei 230026, Peoples R China
来源：
NUCLEAR PHYSICS A | 2016年 / 956卷
关键词：
Dielectron; LMR excess; Vector meson in-medium modification; Chiral symmetry restoration; Medium lifetime; COLLISIONS; COLLABORATION;
D O I：
10.1016/j.nuclphysa.2016.02.072
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：
We present the systematic study of dielectron production in U + U collisions at root S-NN = 193 GeV by Solenoidal Tracker At RHIC (STAR) experiment. Invariant mass, transverse momentum, and centrality differential measurements of dielectron yields are compared to Monte-Carlo hadronic contributions excluding rho-meson. In each comparison, there is an excess in the Low Mass Region (LMR) that can be described by a model calculation including a broadened rho spectral function. With detector acceptance correction applied, the dielectron excess invariant mass spectra in U + U collisions at,root S-NN = 193 GeV and in Au + Au collisions at root S-NN = 27, 39, and 62.4 GeV are reported. System-size and energy dependences of low mass excess yield are discussed together with model comparisons.
引用
收藏
页码：429 / 432
页数：4
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