探索小碰撞系统中流动谐波和横向动量之间相关性的起源（无ambiguity）
Exploring Origins for Correlations between Flow Harmonics and Transverse Momentum in Small Collision Systems (Unambiguous Ambiguity)
摘要：
在相对论重离子对撞机（RHIC）和大型强子对撞机（LHC）的实验中获得的具有小型和大型碰撞物种的高统计数据集已经实现了大量新的流量测量，包括可观测量之间的事件相关性。一个令人兴奋的这样的可观测的$ρ(v^{2}_{n},[p_{T}])$测量事件中粒子的平均横向动量与同一事件中的各种流动系数（$v_n$）之间的相关性[1]。最近有人提出，非常低的多重性事件可能对初始状态的Glasma相关性敏感[2]，而不是与流动相关的动力学。我们发现，利用IP-JAZMA框架的颜色域解释的玻璃结果是不完整的。然后，我们探索预测PYTHIA-8，包括核碰撞称为PYTHIA-ANGANTYR，只有非流动的相关性和AMPT模型，其中既有非流动和流动型的相关性的版本。我们发现PYTHIA-ANGANTYR在p+O，p+Pb，O+O碰撞中对$ρ(v^{2}_{n},[p_{T}])$有非流动贡献，在低多重数下为正，与玻璃关联相当.令人惊讶的是，在PYTHIA-8中，p+p碰撞中，实际上有一个从正到负的符号变化$ρ(v^{2}_{n},[p_{T}])$作为多重数的函数。AMPT的结果相匹配的实验数据在LHC的Pb+Pb碰撞的一般趋势，除了在低多重数的AMPT有相反的符号。在p+Pb碰撞中，AMPT具有与实验数据相反的符号，我们在部分子几何的背景下探索这一点。对p+O、O+O和n + n的预测也给出了。
英文摘要：
High statistics data sets from experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) with small and large collision species have enabled a wealth of new flow measurements, including the event-by-event correlation between observables. One exciting such observable $ρ(v^{2}_{n},[p_{T}])$ gauges the correlation between the mean transverse momentum of particles in an event and the various flow coefficients ($v_n$) in the same event [1]. Recently it has been proposed that very low multiplicity events may be sensitive to initial-state glasma correlations [2] rather than flow-related dynamics. We find utilizing the IP-JAZMA framework that the color domain explanation for the glasma results are incomplete. We then explore predictions from PYTHIA-8, and the version for including nuclear collisions called PYTHIA-ANGANTYR, which have only non-flow correlations and the AMPT model which has both non-flow and flow-type correlations. We find that PYTHIA-ANGANTYR has non-flow contributions to $ρ(v^{2}_{n},[p_{T}])$ in p+O, p+Pb, O+O collisions that are positive at low multiplicity and comparable to the glasma correlations. It is striking that in PYTHIA-8 in p+p collisions there is actually a sign-change from positive to negative $ρ(v^{2}_{n},[p_{T}])$ as a function of multiplicity. The AMPT results match the experimental data general trends in Pb+Pb collisions at the LHC, except at low multiplicity where AMPT has the opposite sign. In p+Pb collisions, AMPT has the opposite sign from experimental data and we explore this within the context of parton geometry. Predictions for p+O, O+O, and Xe+Xe are also presented.
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