π介子谱的电荷依赖性  

Charge dependence of pion spectra

作　　者：张勇 丁慧强 王诗瑶 ZHANG Yong;DING Huiqiang;WANG Shiyao(School of Mathematics and Physics,Jiangsu University of Technology,Changzhou 213001,China;School of Physics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]江苏理工学院数理学院,江苏常州213001 [2]大连理工大学物理学院,辽宁大连116024

出　　处：《江苏理工学院学报》2022年第2期35-41,共7页Journal of Jiangsu University of Technology

基　　金：国家自然科学基金资助项目“LHC能区小碰撞系统中奇异和重夸克介子的压缩关联”(11905085)。

摘　　要：正反带电π介子电荷存在差异,其与高能重离子碰撞所产生环境的相互作用是不一致的,因此介质中正反带电π介子的质量存在差异。通过研究介质中正反π介子质量差异对其动量谱的影响,结果表明:正反π介子介质质量差异会导致正反π介子动量谱存在差异,出现电荷依赖;正反π介子谱的差异随着介质质量差异的增大而增大;在小横动量区域,正反π介子谱的差异对源膨胀速度和横向动量没有依赖性;在大横动量区域,正反π介子谱的差异随着横动量的增加而减小,但随着源膨胀速度的增加而增大。Due to the difference of charge between positive and negative charged pion,the interaction between positive and negative charged pion and the environment produced by high-energy heavyion collisions is inconsistent,so the masses of positive and negative charged pion in the medium are also different. In this paper,we study the influence of the mass difference of positive and negative pion mesons in the medium on its momentum spectrum. The results show that the in-medium mass difference leads to the charge dependence of the positive and negative pion. The difference between the positive and negative pion spectra increases with the increasing in-medium mass difference. In small transverse momentum regions,the difference between the positive and negative pion spectra does not depend on the source expansion velocity and transverse momentum. In large transverse momentum regions,the difference between positive and negative pion spectra decreases with the increasing transverse momentum,but increases with the increasing source expansion velocity.

关 键 词：高能重离子碰撞 Π介子 谱 电荷依赖 

分 类 号：O41[理学—理论物理]