Title: Anatomy of QCD Strings and Saturation Effects in High-Energy Scattering Show Chinese title

Title: QCD弦的结构和高能散射中的饱和效应

Abstract: We develop a model to compute high-energy reactions of hadrons and photons. The perturbative interaction is described by gluon exchange and the non-perturbative interaction by the stochastic vacuum model which leads to quark-confinement in dipoles via a string of color fields. We study the QCD structure of the dipole-dipole scattering in momentum space focussing especially on interactions between strings. We represent the string as a collection of stringless dipoles, show confinement effects in high-energy scattering and calculate unintegrated gluon distributions of hadrons and photons. In the impact parameter space of the scattering process we investigate the unitarity limit of the S-matrix. We calculate the impact parameter profiles for proton-proton and photon-proton scattering, determine the energy values at which the profiles saturate at the black disc limit, estimate the impact parameter dependent gluon distribution of the proton and discuss gluon saturation. We compare the model results for p p, pi p, K p, gamma p and gamma gamma reactions with experimental data and identify saturation effects in experimental observables. Show Chinese abstract

Abstract: 我们开发了一个模型来计算强子和光子的高能反应。 微扰相互作用由胶子交换描述，非微扰相互作用由随机真空模型描述，该模型通过色场字符串导致偶极子中的夸克禁闭。 我们研究动量空间中偶极子-偶极子散射的QCD结构，特别关注字符串之间的相互作用。 我们将字符串表示为无弦偶极子的集合，展示高能散射中的禁闭效应，并计算强子和光子的非积分胶子分布。 在散射过程的碰撞参数空间中，我们研究S矩阵的单位性极限。 我们计算质子-质子和光子-质子散射的碰撞参数轮廓，确定轮廓在黑盘极限下饱和的能量值，估计质子的碰撞参数依赖胶子分布并讨论胶子饱和。 我们将该模型对pp、πp、Kp、γp和γγ反应的结果与实验数据进行比较，并在实验可观测量中识别出饱和效应。