Directed flow in asymmetric nucleus-nucleus collisions and the inverse Landau-Pomeranchuk-Migdal effect
Directed flow in asymmetric nucleus-nucleus collisions and the inverse Landau-Pomeranchuk-Migdal effect
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DOI：
10.1103/physrevc.95.034911
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发表时间：
2016-10
影响因子：
3.1
通讯作者：
V. Toneev;V. Voronyuk;E. Kolomeitsev;W. Cassing
中科院分区：
文献类型：
--
作者：
V. Toneev;V. Voronyuk;E. Kolomeitsev;W. Cassing
提出了通过观察具有相同质量但电荷相反的强子的赝快度和横向动量分布来识别在非对称核的相对论碰撞中产生的强电场。用Parton-Hadron弦动力学(PHSD)方法对含电荷的定向流进行了详细的计算，给出了在{S NN}=200$GeV处的半中心铜和金碰撞的详细计算结果，该结果解释了电磁相互作用随荷电自由度的延迟.计入iLPM效应后，我们得到了与最近的测量结果相一致的电荷分裂的PHSD结果，该结果与最近关于铜和金碰撞中的恒星合作的测量结果是一致的，而在硬碰撞顶点处的电荷的瞬时出现和耦合高估了分裂约10倍。我们预测iLPM效应在能量为S{S{NN}}的能量下实际上应该消失，这将导致在未来的FIRE/NICA设施中有一个更大的电荷分裂，达到$V1$。
It is proposed to identify a strong electric field - created during relativistic collisions of asymmetric nuclei - via the observation of pseudorapidity and transverse momentum distributions of hadrons with the same mass but opposite charge. The results of detailed calculations within the Parton-Hadron String Dynamics (PHSD) approach for the charge-dependent directed flow $v_1$ are presented for semi-central Cu+Au collision at $\sqrt{s_{NN}}=200$ GeV incorporating the inverse Landau-Pomeranchuk-Migdal (iLPM) effect, which accounts for a delay in the electromagnetic interaction with the charged degree of freedom. Including the iLPM effect we achieve a reasonable agreement of the PHSD results for the charge splitting in $v_1(p_T)$ in line with the recent measurements of the STAR Collaboration for Cu+Au collisions at $\sqrt{s_{NN}}=200$ GeV while an instant appearance and coupling of electric charges at the hard collision vertex overestimates the splitting by about a factor of 10. We predict that the iLPM effect should practically disappear at energies of $\sqrt{s_{NN}} \approx$9 GeV, which should lead to a significantly larger charge splitting of $v_1$ at the future FAIR/NICA facilities.