Energy dependence of pion in-medium effects on the π-/π+ ratio in heavy-ion collisions

被引：33

作者：

Xu, Jun ^{[1
]}

Chen, Lie-Wen ^{[2
,3
]}

Ko, Che Ming ^{[4
,5
]}

Li, Bao-An ^{[6
,7
]}

Ma, Yu-Gang ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[2] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

[3] Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China

[4] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[5] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[6] Texas A&M Univ Commerce, Dept Phys & Astron, Commerce, TX 75429 USA

[7] Xi An Jiao Tong Univ, Dept Appl Phys, Xian 710049, Peoples R China

来源：

PHYSICAL REVIEW C | 2013年 / 87卷 / 06期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

SYMMETRY ENERGY; ISOSPIN PHYSICS; EQUATION; STATE;

D O I：

10.1103/PhysRevC.87.067601

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：

Within the framework of a thermal model with its parameters fitted to the results from an isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model, we have studied the pion in-medium effect on the charged-pion ratio in heavy-ion collisions at various energies. We find that due to the cancellation between the effects from pion-nucleon s-wave and p-wave interactions in nuclear medium, the pi(-)/pi(+) ratio generally decreases after including the pion in-medium effect. The effect is larger at lower collision energies as a result of narrower pion spectral functions at lower temperatures.

引用

页数：4

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