硬过程对椭圆流的贡献
The contribution of hard processes to elliptic flow
摘要：
我研究了一个可能的影响，动量沉积从许多硬部分子穿越热和密集的区域产生的早期核碰撞在大型强子对撞机。这种硬部分子的预期数量是很大的。有人认为，诱导扩散尾流携带的动量沉积到介质中可能会相互作用。由于在非中心碰撞中方位角不对称的几何形状，这可能导致集体流在碰撞参量的方向上的小偏好。结果表明，强子谱的方位不对称性有很小的贡献。如果要根据椭圆流参数v2的测量结果得出关于早期热化和低粘度的定量结论，则即使考虑到这样小的贡献也是重要的。
英文摘要：
I study a possible effect of momentum deposition from many hard partons traversing the hot and dense region produced early in nuclear collisions at the LHC. The expected number of such hard partons is large. It is argued that the induced diffusion wakes which carry the momentum deposited to the medium may interact. Due to azimuthally asymmetric geometry in non-central collisions, this may lead to small preference of the collective flow in the direction of the impact parameter. As a result, a small contribution to the azimuthal asymmetry of hadronic spectra is obtained. It may be important to take even such a small contribution into account if quantitative conclusions about early thermalisation and low viscosity are to be made, based on the measurements of the elliptic flow parameter v2.
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