arXiv 1503.038972015-03-12hep-phnucl-th

高能pA碰撞中各向异性粒子的产生和方位角关联

Anisotropic particle production and azimuthal correlations in high-energy pA collisions

Adrian Dumitru, Andre V. Giannini, Vladimir Skokov

备注：: Combined write-up of the presentations by the authors at the Initial Stages 2014 Conference, Napa, 3-7 December 2014

摘要：

我们总结了一些最近的想法，有关各向异性粒子的生产在高能碰撞。各向异性胶子分布导致单粒子方位角分布的各向异性，从而导致对多粒子累积量的不连续贡献。当这些占主导地位时，四粒子椭圆各向异性$c_2\{4\}$改变符号。另一方面，连接图的$m$粒子累积量被发现迅速饱和与增加$m$，一个“相干”完全不同于传统的"非流动“的贡献，如衰变。最后，我们进行了第一次探索性的唯象分析，以估计振幅${\cal A}$的$\cos(2φ)$各向异性的胶子分布在小$x$，我们提供了一个定性预测的椭圆不对称性从三粒子相关，$c_2\{3\}$。

英文摘要：

We summarize some recent ideas relating to anisotropic particle production in high-energy collisions. Anisotropic gluon distributions lead to anisotropies of the single-particle azimuthal distribution and hence to disconnected contributions to multi-particle cumulants. When these dominate, the four-particle elliptic anisotropy $c_2\{4\}$ changes sign. On the other hand, connected diagrams for $m$-particle cumulants are found to quickly saturate with increasing $m$, a ``coherence'' quite unlike conventional ``non-flow'' contributions such as decays. Finally, we perform a first exploratory phenomenological analysis in order to estimate the amplitude ${\cal A}$ of the $\cos(2φ)$ anisotropy of the gluon distribution at small $x$, and we provide a qualitative prediction for the elliptic asymmetry from three-particle correlations, $c_2\{3\}$.

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英文摘要：

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