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

页码：429 / 432

页数：4

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