论文标题
探测最初的重子制止和状态方程，并依赖于差异的颗粒流动流
Probing initial baryon stopping and equation of state with rapidity-dependent directed flow of identified particles
论文作者
论文摘要
使用具有参数初始条件的（3+1）二维混合框架，我们研究了重型离子碰撞中的已鉴定颗粒的速度依赖性定向流$ v_1（y）$，包括乳头，kaons，protons和lambdas。考虑了涉及Au+Au碰撞的情况，以$ \ sqrt {s _ {\ rm nn}}} $从7.7到200 GEV进行执行。光束方向上的动力学使用带电颗粒的伪长度分布和净质子快速分布来限制。在此框架内，介子的有向流是由倾斜源的侧向压力梯度驱动的，而巴里恩斯的侧向压力梯度主要是由于初始不对称的巴赛子分布相对于由横向膨胀驱动的梁轴。我们的方法成功地重现了介子和重子的$ v_1 $的速度和光束能量依赖性。我们发现，$ v_1（y）$的baryons在最初的重子停止上具有强大的约束功率，并且与介子的介子相同，有针对性的流动探针在有限的化学势下密集的核物质状态方程。
Using a (3+1)-dimensional hybrid framework with parametric initial conditions, we study the rapidity-dependent directed flow $v_1(y)$ of identified particles, including pions, kaons, protons, and lambdas in heavy-ion collisions. Cases involving Au+Au collisions are considered, performed at $\sqrt{s_{\rm NN}}$ ranging from 7.7 to 200 GeV. The dynamics in the beam direction is constrained using the measured pseudo-rapidity distribution of charged particles and the net proton rapidity distribution. Within this framework, the directed flow of mesons is driven by the sideward pressure gradient from the tilted source, and that of baryons mainly due to the initial asymmetric baryon distribution with respect to the beam axis driven by the transverse expansion. Our approach successfully reproduces the rapidity- and beam energy-dependence of $v_1$ for both mesons and baryons. We find that the $v_1(y)$ of baryons has strong constraining power on the initial baryon stopping, and together with that of mesons, the directed flow probes the equation of state of the dense nuclear matter at finite chemical potentials.
