论文标题
探测超级夸张的重型离子碰撞中的初始纵向密度和电磁场
Probing the initial longitudinal density profile and electromagnetic field in ultrarelativistic heavy-ion collisions with heavy quarks
论文作者
论文摘要
重夸克是电磁场的宝贵探针，也是高能核碰撞中产生的夸克 - 胶质等离子体（QGP）物质的初始条件。在改进的Langevin模型中，该模型与（3+1）维粘性的水动力模型耦合在一起，我们探索了在相反的充电器之间探索有向的流量系数（$ v_1 $）的重膜及其衰减leptons及其衰减leptons及其衰减lepton的起源（$ΔV_{1} $）。我们发现，虽然重味$ v_1 $的速度依赖性主要是由QGP的标题为RHIC能量纵向方向的能量密度谱驱动的，但它由LHC能量的电磁场主导。 $ΔV_{1} $是电磁场的时空演化曲线的新颖探针。我们的$ D $介子及其衰减电子的结果与RHIC和LHC上的可用数据一致，我们对重型风味衰减us的预测可以通过未来的测量进行进一步测试。
Heavy quarks are valuable probes of the electromagnetic field and the initial condition of the quark-gluon plasma (QGP) matter produced in high-energy nuclear collisions. Within an improved Langevin model that is coupled to a (3+1)-dimensional viscous hydrodynamic model, we explore the origin of the directed flow coefficient ($v_1$) of heavy mesons and their decay leptons, and its splitting ($Δv_{1}$) between opposite charges. We find that while the rapidity dependence of the heavy flavor $v_1$ is mainly driven by the titled energy density profile of the QGP with respect to the longitudinal direction at the RHIC energy, it is dominated by the electromagnetic field at the LHC energy. The $Δv_{1}$ serves as a novel probe of the spacetime evolution profile of the electromagnetic field. Our results of $D$ mesons and their decay electrons are consistent with the available data at RHIC and LHC, and our predictions on the heavy flavor decay muons can be further tested by future measurements.
