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：
美国国家科学基金会; 美国国家航空航天局;
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.
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页数：4
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