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arXiv 1708.02076hep-phnucl-th
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p+Pb碰撞中初态和终态效应对方位角关联的重要性

Importance of initial and final state effects for azimuthal correlations in p+Pb collisions

Moritz Greif, Carsten Greiner, Björn Schenke, Sören Schlichting, Zhe Xu

备注：
6 pages, 4 figures
发表信息：
Phys. Rev. D 96, 091504 (2017)
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摘要：

研究了在低重数和高重数p+Pb碰撞中初态和末态效应对胶子方位角关联的相对重要性。为了实现这一点，我们耦合杨米尔斯动力学的预平衡胶子场（IP-GLASMA）的微扰QCD为基础的最终状态演化（BAMPS）的级联事件的基础上。我们发现，签名的初态关联和末态相互作用被视为方位角相关观测，如$v_2\left\lbrace2PC\right\rbrace(p_T)$，其强度取决于事件的多重性和横向动量。在横向动量$p_T>2~{\rm GeV}$的低多重性事件中，初始状态相关性占主导地位的$v_2\left\lbrace2PC\right\rbrace(p_T)$。虽然最终状态相互作用在高多重性事件中占主导地位，但初始状态相关性影响PDMATHAMN的$v_2\left\lbrace2PC\right\rbrace(p_T)$以及pT集成的$v_2\left\lbrace2PC\right\rbrace$。

英文摘要：

We investigate the relative importance of initial and final state effects on azimuthal correlations of gluons in low and high multiplicity p+Pb collisions. To achieve this, we couple Yang-Mills dynamics of pre-equilibrium gluon fields (IP-GLASMA) to a perturbative QCD based parton cascade for the final state evolution (BAMPS) on an event-by-event basis. We find that signatures of both the initial state correlations and final state interactions are seen in azimuthal correlation observables, such as $v_2\left\lbrace2PC\right\rbrace(p_T)$, their strength depending on the event multiplicity and transverse momentum. Initial state correlations dominate $v_2\left\lbrace2PC\right\rbrace(p_T)$ in low multiplicity events for transverse momenta $p_T>2~{\rm GeV}$. While final state interactions are dominant in high multiplicity events, initial state correlations affect $v_2\left\lbrace2PC\right\rbrace(p_T)$ for $p_T>2~{\rm GeV}$ as well as the pT integrated $v_2\left\lbrace2PC\right\rbrace$.

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