arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.00633nucl-exhep-ex
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$\sqrt{s_{\rm{NN}}}$ = 5.02 TeV的Pb-Pb碰撞中带电强子的高次谐波非线性流动模

Higher harmonic non-linear flow modes of charged hadrons in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV

ALICE Collaboration

摘要:

在$\sqrt{s_\rm{NN}}=5.02$ TeV的Pb-Pb碰撞中测量了各向异性流动系数$v_n$、非线性流动模式系数$χ_{n,mk}$和不同对称面之间的相关$ρ_{n,mk}$。多粒子关联得到的结果报告的横向动量间隔$0.2<p_\rm{T}<5.0$ GeV/ $c$的赝快度间隔$0.4<|η|<0.8$作为碰撞中心的函数。$v_n$系数以及$χ_{n,mk}$和$ρ_{n,mk}$分别被呈现到第九和第七谐波阶。计算表明,在不同对称平面上测得的相关系数和非线性流模系数依赖于重离子碰撞中产生的介质的剪切和体粘滞熵比。这些测量值和那些在较低的能量和计算从流体动力学模型之间的比较放置强有力的约束系统的初始条件和传输特性。

英文摘要:

Anisotropic flow coefficients, $v_n$, non-linear flow mode coefficients, $χ_{n,mk}$, and correlations among different symmetry planes, $ρ_{n,mk}$ are measured in Pb-Pb collisions at $\sqrt{s_\rm{NN}}=5.02$ TeV. Results obtained with multi-particle correlations are reported for the transverse momentum interval $0.2<p_\rm{T}<5.0$ GeV/$c$ within the pseudorapidity interval $0.4<|η|<0.8$ as a function of collision centrality. The $v_n$ coefficients and $χ_{n,mk}$ and $ρ_{n,mk}$ are presented up to the ninth and seventh harmonic order, respectively. Calculations suggest that the correlations measured in different symmetry planes and the non-linear flow mode coefficients are dependent on the shear and bulk viscosity to entropy ratios of the medium created in heavy-ion collisions. The comparison between these measurements and those at lower energies and calculations from hydrodynamic models places strong constraints on the initial conditions and transport properties of the system.

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