动量依赖的介质效应对D介子谱和流的影响  

Effect of mass-shift with momentum change on D meson spectrum and elliptic flow

作　　者：尹洪杰 冯佳惠 张勇 YIN Hongjie;FENG Jiahui;ZHANG Yong(College of Physical Science and Technology,Bohai University,Jinzhou 121013,China;School of Mathematics and Physics,Jiangsu University of Technology,Changzhou 213001,China)

机构地区：[1]渤海大学物理科学与技术学院,辽宁锦州121013 [2]江苏理工学院数理学院,江苏常州213001

出　　处：《渤海大学学报（自然科学版）》2022年第3期258-264,共7页Journal of Bohai University:Natural Science Edition

基　　金：国家自然科学基金青年项目(No:11905085)。

摘　　要：高能重离子碰撞中热力学冻出前的粒子处于介质内部,介质效应会影响粒子的末态信息.研究表明,若介质效应对所有动量的粒子都是一样的,则在大动量区域对粒子谱会起很强的增强作用,但在实验中并没有出现这一现象,因此要考虑介质效应是否随动量变化.通过研究随动量变化的介质效应对D介子谱和椭圆流的影响,得出在大动量区域介质效应对D介子产额起增强作用,此现象随着能量密度的增加而减弱,并且介质效应越强,该现象越明显.介质效应对椭圆流起抑制作用,该作用随着能量密度的增加而减弱,并且介质效应越强,抑制作用越明显,介质效应对D介子椭圆流的抑制作用更加准确.In high-energy heavy ion collisions, particles are in the medium before thermal freeze-out, the mass shift affects the particle’s terminal state information.The study has shown that particle spectrum in the large momentum area will be enhanced if mass shift is the same for all momentum of particles.However, the phenomenon does not appear in the experiments, so it is necessary to consider whether or not the mass shift will change with momentum.The paper mainly researches that the influence of mass shift with momentum change on D meson spectrum and elliptic flow.It is found that mass shift will enhances D meson yield in large momentum region, which decreases with the increase of energy density.The stronger mass shift is, the more obvious phenomenon is.The mass shift has an inhibitory effect on elliptic flow, which decreases with the increase of energy density.The inhibitory effect appears more obviously as the mass shift becomes stronger.The inhibition effect of mass shift on elliptic flow of D meson is more accurate.

关 键 词：介质效应 D介子 椭圆流 粒子谱 

分 类 号：O571.6[理学—粒子物理与原子核物理]