Impact of Glasma on heavy quark observables in nucleus-nucleus collisions at LHC

Impact of Glasma on heavy quark observables in nucleus-nucleus collisions at LHC
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格拉斯玛对大型强子对撞机核-核碰撞中重夸克可观测值的影响

DOI:
10.1016/j.physletb.2019.134933
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发表时间:
2019-02
期刊:
影响因子:
4.4
通讯作者:
Santosh Kumar Das
Santosh Kumar Das
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yifeng Sun;Gabriele Coci;Santosh Kumar Das

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在相对论重离子碰撞的预热平衡阶段,根据经典的杨-米尔(Cym)方程,在τ0≃0.1fm/c附近出现一个强的准经典横向胶子场,并与纵向胶子场一起演化。最近的研究表明,这些场可以诱导魅力夸克在动量空间中的扩散,从而使它们的能谱发生倾斜,而不会产生明显的阻力。我们发现,在LHC的核-核碰撞中,这种新的魅力夸克动力学导致了在pT大于2GeV/c时核修正因子(RA)的初始增强,这与标准的理论相反。此外,同样的动力学导致了更大的最终椭圆流(V2),从而导致Ra和v2之间的关系非常接近于实验测量。我们的研究还表明,这样的初始预热阶段不太可能用标准的阻力和扩散动力学来描述,因为即使调整这样的系数来再现相同的RA A(P T),这也意味着v2要小得多。
In the pre-thermal equilibrium stage of relativistic heavy-ion collisions, a strong quasi-classical transverse gluon field emerges at about τ 0≃ 0.1 fm/c and evolves together with their longitudinal counterparts according to the classical Yang-Mills (CYM) equations. Recently it has been shown that these fields induce a diffusion of charm quarks in momentum space resulting in a tilt of their spectrum without a significant drag. We find that in nucleus-nucleus collisions at LHC such a novel dynamics of charm quarks leads to an initial enhancement of the nuclear modification factor (R A A) at p T larger than 2 GeV/c contrary to the standard lore. Moreover, the same dynamics leads to a larger final elliptic flow (v 2) inducing a relation between R A A and v 2 that is quite close to the experimental measurements. Our study also shows that such an initial pre-thermal stage is unlikely to be described in terms of a standard drag and diffusion dynamics, because even if one tune such coefficients to reproduce the same R A A (p T) this would imply a significantly smaller v 2.
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