论文标题
重型离子碰撞中的涡旋环$ \ sqrt {s_ {nn}} = $ 3--30 GEV及其观察的可能性
Vortex rings in heavy-ion collisions at energies $\sqrt{s_{NN}}=$ 3--30 GeV and possibility of their observation
论文作者
论文摘要
在Collision Energies $ \ sqrt {s_ {nn}} = $ 3-30 GEV中，在Au+au碰撞中出现的环结构进行了研究。计算是在三流体动力学模型中执行的。已经证明，在超中央au+au碰撞$ \ sqrt {s_ {nn}}> $ 4 gev中，形成了一个涡旋环，一个在向前，向后速度的一个，另一个在向后速度。涡旋环带有有关碰撞早期阶段的信息，特别是关于停止重子的信息。结果表明，这些环可以通过测量可观察的$r_λ$来检测到$ 0 <y <y <0.5 $（或$ -0.5 <y <0 $）的0.5---1.5 \％\％$ \ sqrt {s_ {nn}}} = $ 5-20 gev。在前进/后退速度，$r_λ$信号预计会更强。讨论了在非横向极化背景下观察涡流信号的可能性。
The ring structures that appear in Au+Au collisions at collision energies $\sqrt{s_{NN}}=$ 3 -- 30 GeV are studied. The calculations are performed within the model of three-fluid dynamics. It is demonstrated that a pare of vortex rings are formed, one at forward and another at backward rapidities, in ultra-central Au+Au collisions at $\sqrt{s_{NN}}>$ 4 GeV. The vortex rings carry information about early stage of the collision, in particular about the stopping of baryons. It is shown that these rings can be detected by measuring the ring observable $R_Λ$ even in rapidity range $0<y<0.5$ (or $-0.5<y<0$) on the level of 0.5--1.5\% at $\sqrt{s_{NN}}=$ 5 -- 20 GeV. At forward/backward rapidities, the $R_Λ$ signal is expected to be stronger. Possibility of observation of the vortex-ring signal against background of non-collective transverse polarization is discussed.
