Anisotropic Emission from Magnetized Quark-gluon Plasma  

磁化夸克-胶子在等离子体中的非均匀辐射

作　　者：YU Xiaozhu WANG Xinyang 俞笑竹;王昕杨(江苏大学物理系,江苏镇江212013;安徽理工大学力学与光电物理学院基础物理研究中心,安徽淮南232001)

机构地区：[1]Department of Physics,Jiangsu University,Zhenjiang 212013,Jiangsu,China [2]Center for Fundamental Physics,School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,Anhui,China

出　　处：《原子核物理评论》2024年第1期564-572,共9页Nuclear Physics Review

基　　金：安徽理工大学启动经费(YJ20240001)。

摘　　要：this work,the polarization effects of a strongly magnetized quark-gluon plasma are studied at finite temperature.It is found that a background magnetic field can have a strong effect on the photon and dilepton emission rates.It affects not only the total rate but also the angular dependence.In particular,the Landau-level quantization leads to a nontrivial momentum dependence of the photon/dilepton anisotropic flow coefficient on transverse momentum.In the case of photon emission,nonzero coefficients v_(n)(with even n)have opposite signs at small and large values of the transverse momentum.Additionally,the v_(n) signs alternate with increasing vn,and their approximate values decrease as 1/n^(2) in magnitude.The anisotropy of dilepton emission is well-pronounced only at large transverse momenta and small invariant masses.The corresponding Un coefficients are of the same magnitude and show a similar sign-alternative pattern with increasing n as in the photon emission.It is proposed that the anisotropy of the photon and dilepton emission may serve as indirect measurements of the magnetic field.通过研究有限温度下强磁化夸克-胶子等离子体的极化效应,发现背景磁场对光子和双轻子发射率有很强的影响。它不仅影响总发射率,还影响角度相关性。特别是,朗道能级量子化导致光子/双轻子各向异性流系数对横向动量的非平凡动量依赖性。在光子发射的情况下,非零系数v_(n)(n为偶数)在横向动量的很小和很大处具有相反的符号。此外,v_(n)的正负随着n的增加交替出现,其近似绝对值正比于1/n^(2)。双轻子发射的各向异性仅在大横向动量和小不变质量时才会明显出现。相应的vn系数具有相同的量级,并且随着n的增加而显示出与光子发射类似的正负交替模式。光子和双轻子产生过程的各向异性也可以作为对磁场的测量一种重要的间接手段。

关 键 词：heavy ion collision electromagnetic probe strong magnetic field finite temperature theory 

分 类 号：O571.6[理学—粒子物理与原子核物理]