Dielectron production in Au plus Au collisions from STAR

被引：1
|
作者：
Butterworth, Joey [1 ]
机构：
[1] Rice Univ, Houston, TX 77005 USA
来源：
NUCLEAR PHYSICS A | 2014年 / 932卷
关键词：
Dielectons; Beam energy scan; Heavy-ion collisions; Electron;
D O I：
10.1016/j.nuclphysa.2014.09.080
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 from minimum bias Au + Au collisions at root s(NN) = 19.6, 39, and 62.4 GeV along with the production from minimum bias Au + Au collisions at 200 GeV for reference. The spectra are compared to simulated hadronic contributions that do not contain rho-meson contributions. In each comparison, there is an excess in the dielectron yield that is consistent with a medium modified rho-meson and shows no dependence on root s(NN). To further understand the excess, the spectra are compared to the simulated hadronic contributions plus model calculations that include contributions from the medium and rho-mesons with a broadened spectral function. These comparisons are consistent within uncertainties. (C) 2014 CERN. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：318 / 325
页数：8
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