论文标题
HERA关于方位角去相关和带电的粒子多重性光谱探测QCD动力学和量子纠缠效应的数据
HERA data on azimuthal decorrelation and charged particle multiplicity spectra probing QCD dynamics and quantum entanglement effects
论文作者
论文摘要
在HERA的宙斯探测器中研究了领先的射流和散射Lepton之间的方位角去相关角。数据是在HERA II数据研究期中获取的，对应于330 $ \ rm {pb^{ - 1}} $的集成光度。已经提出了方位角的角度去相关，以研究横向动量分布（TMD）演化的$ q^{2} $依赖性，并了解小$ x $区域，从而为核子结构提供了独特的见解。在非常高的横向动量下，在质子 - 蛋白碰撞中已经进行了两种喷气机的先前去相关测量。这些测量值通过近代领先顺序的扰动QCD很好地描述。在这些研究中获得的方位角去相关角度表明，与包括领先顺序矩阵元素和Parton阵雨在内的蒙特卡洛模型的预测良好。 给出了有关带电粒子多重分布的新实验数据，涵盖了动量转移的运动范围$ 5 <q^{2} <100〜 \ rm gev^{2} $和非弹性$ 0.0375 <y <y <0.6 $。在正电子 - 普罗顿碰撞中，在HEA撞机的H1实验中记录了数据，其中质量为320 GEV。带电粒子的横向矩量大于150 MeV，伪质量$ -1.6 <η_ {\ rm Lab} <1.6 $在实验室框架中，对应于Hadronic Centrre-Mass框架的当前半球的高度接受。在$ q^{2} $，$ y $以及$ q^{2} $，$ y $和$η$的三维网格上报告了带电的粒子多重性。可观察到的是在给定$η$区域中观察$ n $粒子的概率$ p（n）$。数据面临着来自蒙特卡洛发生器的预测，以及基于量子纠缠和严格的parton-hadron二元性的简单模型。
The azimuthal decorrelation angle between the leading jet and scattered lepton in deep inelastic scattering is studied with the ZEUS detector at HERA. The data was taken in the HERA II data-taking period and corresponds to an integrated luminosity of 330 $\rm{pb^{-1}}$. Azimuthal angular decorrelation has been proposed to study the $Q^{2}$ dependence of the evolution of the transverse momentum distributions (TMDs) and understand the small-$x$ region, providing unique insight to nucleon structure. Previous decorrelation measurements of two jets have been performed in proton-proton collisions at very high transverse momentum; these measurements are well described by perturbative QCD at next-to-leading order. The azimuthal decorrelation angle obtained in these studies shows good agreement with predictions from Monte Carlo models including leading order matrix elements and parton showers. New experimental data on charged particle multiplicity distributions are presented, covering the kinematic ranges in momentum transfer $5<Q^{2}<100~\rm GeV^{2}$ and inelasticity $0.0375<y<0.6$. The data was recorded with the H1 experiment at the HERA collider in positron-proton collisions at a centre-of-mass energy of 320 GeV. Charged particles are counted with transverse momenta larger than 150 MeV and pseudorapidity $-1.6<η_{\rm lab}<1.6$ in the laboratory frame, corresponding to high acceptance in the current hemisphere of the hadronic centre-of-mass frame. Charged particle multiplicities are reported on a two-dimensional grid of $Q^{2}$, $y$ and on a three-dimensional grid of $Q^{2}$, $y$ and $η$. The observable is the probability $P(N)$ to observe $N$ particles in the given $η$ region. The data are confronted with predictions from Monte Carlo generators, and with a simplistic model based on quantum entanglement and strict parton-hadron duality.
