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arXiv 1607.05623hep-ph
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质子-核碰撞中粒子产生的图象

Pictures of Particle Production in Proton-Nucleus Collisions

Alfred H. Mueller

摘要:

本文主要研究稀(质子)-密(核)碰撞中胶子(喷流)的产生.根据坐标系和规范的不同,胶子的产生可以看作是从质子波函数或核波函数中释放胶子。这些(显然)非常不同的图片必须导致相同的结果,本文的目的是看看这是如何发生的。重点是具有$k_\perp\sim Q_S$的胶子或处于标度区$k_\perp/Q_S\gg 1$的胶子。在含有$k_\perp\sim Q_S$的McLerran-Venugopalan(MV)模型中,我们能够导出胶子的产生,这种胶子产生的方式(图形化地)清楚地显示了根据核波函数中胶子的数密度的$k_\perp$ -因子分解。我们假设,这张图片,和$k_\perp$ -因式分解,继续举行的小- $x$进化的存在,虽然我们还没有能够明确地验证这一点。我们的结果与通常的$k_\perp$ -因式分解是一致的,其中核的胶子数密度没有以显式的方式出现。

英文摘要:

This work focuses on gluon(jet) production in dilute(proton)-dense(nucleus) collisions. Depending on the frame and gauge, gluon production can be viewed as a freeing of gluons coming from either the proton wave function or from the nucleus wave function. These (apparently) very different pictures must lead to the same result and the purpose of this paper is to see how that happens. The focus is on gluons having $k_\perp\sim Q_S$ or gluons in the scaling region $k_\perp/Q_S\gg 1$. In the McLerran-Venugopalan(MV) model with $k_\perp\sim Q_S$ we are able to derive gluon production in a way that (graphically) manifestly shows $k_\perp$-factorization in terms of the number density of gluons in the nuclear wave function. We presume that this picture, and $k_\perp$-factorization, continues to hold in the presence of small-$x$ evolution although we have not been able to explicitly verify this. Our result is in agreement with usual $k_\perp$-factorization where the gluon number density of the nucleus does not appear in an explicit way.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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