论文标题
Xe+Xe碰撞中的纵向流deTryations $ \ sqrt {s _ {\ Mathrm {nn}}}} = 5.44 $ tev with atlas detector
Longitudinal flow decorrelations in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector
论文作者
论文摘要
第一个测量谐波流量的纵向去关系振幅$ n = 2 $，3 = 2 $，3和4 xe+xe碰撞，在$ \ sqrt {s _ {\ m mathrm {nn}}} = 5.44 $ tev使用3 $μ\ textrm \ use textrm \ us vent $ \μ\ textrm {在LHC。发现$ v_3 $和$ v_4 $的去相关信号几乎独立于碰撞中心性和横向动量（$ p _ {\ mathrm {t}} $）对最终状态粒子的要求，但是对于$ v_2 $ $ v_2 $，对于强中心性和$ p _ {\ mathrm {\ mathrm {t t} $ divensece}与$ \ sqrt {s _ {\ mathrm {nn}}}} = 5.02 $ tev相比，与$ \ sqrt {s _ {s _ {s _ {s _ {\ mathrm {\ mathrm {\ mathrm {\ mathrm {\ mathrm {\ sqrt {当前的流体动力模型重现了XE+XE碰撞与PB+PB碰撞中的$ V_N $的比率，但未能描述XE+XE和Pb+Pb之间纵向流动性的大小和趋势。系统尺寸依赖性的结果为重型离子碰撞中初始状态的纵向结构与其他早期和晚期效应的纵向结构分开的影响提供了新的见解和重要的杠杆臂。
The first measurement of longitudinal decorrelations of harmonic flow amplitudes $v_n$ for $n=2$, 3 and 4 in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV is obtained using 3 $μ\textrm{b}^{-1}$ of data with the ATLAS detector at the LHC. The decorrelation signal for $v_3$ and $v_4$ is found to be nearly independent of collision centrality and transverse momentum ($p_{\mathrm{T}}$) requirements on final-state particles, but for $v_2$ a strong centrality and $p_{\mathrm{T}}$ dependence is seen. When compared with the results from Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, the longitudinal decorrelation signal in mid-central Xe+Xe collisions is found to be larger for $v_2$, but smaller for $v_3$. Current hydrodynamic models reproduce the ratios of the $v_n$ measured in Xe+Xe collisions to those in Pb+Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe+Xe and Pb+Pb. The results on the system-size dependence provide new insights and an important lever-arm to separate effects of the longitudinal structure of the initial state from other early-time and late-time effects in heavy-ion collisions.
