Influence of initial-state momentum anisotropy on the final-state collectivity in small collision systems
Influence of initial-state momentum anisotropy on the final-state collectivity in small collision systems
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DOI：
10.1103/physrevc.100.064905
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发表时间：
2019-06
影响因子：
3.1
通讯作者：
M. Nie;L. Yi;Xiaofeng Luo;G. Ma;J. Jia
中科院分区：
文献类型：
--
作者：
M. Nie;L. Yi;Xiaofeng Luo;G. Ma;J. Jia
利用多相输运模型研究了小系统碰撞中长程集体方位关联的起源。为了解开集体与初始状态的内禀动量各向异性和集体之间产生的碰撞几何形状的最终状态的响应，我们研究了集体在5.02 TeV $p$+铅碰撞的发展与初始状态和最终状态的影响。我们发现，初始动量各向异性可能不会完全各向同性通过部分子相互作用，和最终状态的部分子集体一般都与初始动量各向异性和碰撞几何形状。初始动量的各向异性还通过集体流的事件涨落影响事件。因此，仅仅是集体流的几何响应的证据不能排除来自初始状态的大的贡献的存在。
A multi-phase transport model is used to understand the origin of long-range collective azimuthal correlations in small-system collisions. To disentangle between collectivity associated with initial-state intrinsic momentum anisotropy and the collectivity arising as a final-state response to the collision geometry, we studied the development of collectivity in 5.02 TeV $p$+Pb collisions with both initial-state and final-state effects included. We find that the initial momentum anisotropy may not be fully isotropized through parton interactions, and the final-state partonic collectivity in general are correlated with both the initial momentum anisotropy and the shape of the collision geometry. The initial momentum anisotropy also influences the event by event fluctuation of collective flow. Therefore the mere evidence of geometry response of the collective flow can not rule out the presence of large contributions from the initial state.