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arXiv 1807.02783hep-ph
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CGC/饱和方法：重新考虑角相关中的奇次谐波问题

CGC/saturation approach: re-visiting the problem of odd harmonics in angular correlations

E. Gotsman, E. Levin

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22 pp. 21 figures in eps files
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摘要：

在本文中，我们表明，选择不同的多重性的事件产生的粒子，导致违反的方位角对称性，$ϕ\to π- ϕ$。我们发现，对于LHC和较低的能量，这种违反可以是如此之大的事件与多重性$n \geq 2 \bar{n}$，其中$\bar{n}$是平均多重性，它导致几乎没有抑制$v_n$，与奇数$n$。然而，只有当具有核靶的DIS中偶极子的典型尺寸很小或$Q^2 \,>\,Q^2_s\Lb A, Y_{\rm min},b\Rb$时，才会发生这种情况，其中$Q_s$是$Y = Y_{\rm min}$处的核饱和动量。在大尺寸的偶极子的情况下，当$Q^2 \,<\,Q^2_s\Lb A, Y_{\rm min},b\Rb$，我们表明，$v_n =0$为奇数$n$。讨论了强子-核散射。

英文摘要：

In this paper we demonstrate that the selection of events with different multiplicities of produced particles, leads to the violation of the azimuthal angular symmetry, $ϕ\to π- ϕ$. We find for LHC and lower energies, that this violation can be so large for the events with multiplicities $n \geq 2 \bar{n}$, where $\bar{n}$ is the mean multiplicity, that it leads to almostno suppression of $v_n$, with odd $n$. However, this can only occur if the typical size of the dipole in DIS with a nuclear target is small, or $Q^2 \,>\,Q^2_s\Lb A, Y_{\rm min},b\Rb$, where $Q_s$ is the saturation momentum of the nucleus at $Y = Y_{\rm min}$. In the case of large sizes of dipoles, when $Q^2 \,<\,Q^2_s\Lb A, Y_{\rm min},b\Rb$, we show that $v_n =0$ for odd $n$. Hadron-nucleus scattering is discussed.

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