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arXiv 0907.2431nucl-ex
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未来电子-离子对撞机的e+A物理学

e+A physics at a future Electron-Ion Collider

M. A. C. Lamont

摘要:

未来的电子-离子对撞机(EIC)是研究$\sqrt{s}$ = 63 - 158(40 - 110)GeV/A的e+p(e+A)碰撞中核子和核中胶子分布的理想实验室。虽然HERA已经对核子中的胶子分布进行了广泛的研究,但关于核中$x <$ 0.1的胶子分布的信息非常少。在HERA发现的核子中,低$x$的胶子动量分布的快速增加,如果不被驯服,将导致对小$x$的Froissart么正性界限的破坏。这可以在非线性QCD中通过允许低$x$胶子的重组直到胶子密度饱和来实现。了解饱和度不仅是量子色动力学的一个重要目标,也是理解重离子碰撞初始条件的一个重要目标。在本文中,我描述的物理,将探索由e+A碰撞,饱和更容易探索在这种模式下,在EIC比在e+p碰撞由于实现大的核密度。

英文摘要:

A future Electron-Ion Colllider (EIC) is the ideal laboratory for studying the gluon distributions in both nucleons and nuclei for $\sqrt{s}$ = 63 - 158 (40 - 110) GeV/A for e+p (e+A) collisions. Whilst gluon distributions have been studied extensively in nucleons at HERA, there is very little information on them for $x <$ 0.1 in nuclei. The rapid increase in the gluon momentum distribution at low-$x$ in nucleons found at HERA, if not tamed, leads to the violation of the Froissart Unitarity Bound at small-$x$. This can be achieved in non-linear QCD by allowing for the recombination of low-$x$ gluons until saturation of gluon densities occurs. Understanding saturation is an important goal not just for QCD in general, but also in understanding the initial conditions of heavy-ion collisions in particular. In this paper, I describe the physics that will be explored by e+A collisions, where saturation is more easily explored in this mode at an EIC than in e+p collisions due to the large nuclear densities achieved.

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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