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首页> 外文期刊>Physical review, D >Confronting the impact parameter dependent JIMWLK evolution with HERA data
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Confronting the impact parameter dependent JIMWLK evolution with HERA data

机译：将与冲击参数相关的JIMWLK进化与HERA数据相面对

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The small- x evolution of protons is determined from numerical solutions of the JIMWLK equations, starting from an initial condition at moderate x for a finite size proton. The resulting dipole amplitude is used to calculate the total reduced cross section σ r and charm reduced cross section σ r c , as well as diffractive vector meson production. We compare results to experimental data from HERA and discuss fundamental problems arising from the regime sensitive to nonperturbative physics. We emphasize that information on the gluonic content of the proton, gluon spatial distributions and correlations over wide ranges in x , which can in principle be constrained by our study, are essential ingredients for describing the initial state in proton-proton and proton-ion collisions. Future electron nucleus collisions at an electron-ion collider will provide important additional insight for heavier nuclei. We further demonstrate that it is not possible to rigorously probe the saturation regime of the color glass condensate framework in electron-proton collisions at HERA energies and that electron-heavy ion collisions will be essential to access its regime of validity.
机译：质子的小x演化是根据JIMWLK方程的数值解确定的，从有限大小的质子的中等x的初始条件开始。所得的偶极子振幅用于计算总的减小的截面σr和魅力减小的截面σr c以及衍射矢量介子的产生。我们将结果与来自HERA的实验数据进行比较，并讨论了由对非微扰物理敏感的体系引起的基本问题。我们强调，关于质子胶子含量，胶子空间分布及其在x范围内的相关性的信息，原则上可以受我们的研究限制，是描述质子-质子和质子-离子碰撞的初始状态的基本要素。在电子-离子对撞机上未来的电子核碰撞将为重核提供重要的附加见解。我们进一步证明，不可能在HERA能量下的电子-质子碰撞中严格探测彩色玻璃冷凝物骨架的饱和状态，而重电子离子碰撞对于获得其有效性状态至关重要。

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