论文标题
朝着从晶格量子染色体动力学中确定细胞核中的Gluon螺旋分布
Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics
论文作者
论文摘要
我们介绍了第一个探索性晶格量子染色体动力学（QCD）计算核子中极化的gluon ioffe ioffe pseudo-distribution。 Ioffe时伪分布提供了一个独立的框架和规范的框架，以确定第一原理中细胞核中的Gluon螺旋性。我们使用$ 32^3 \ times 64 $的晶格合奏采用高统计计算，其特征是$ 358 $ MEV PION质量和$ 0.094 $ $ FM fm lattice Spacing。我们建立了伪分发方法，作为一种解决质子旋转难题的可行方法，并在未来预期的统计和系统不确定性方面取得了连续的改善。在数据的统计精度中，我们发现晶格确定的极化Gluon Ioffe时间分布与最新全局分析的相应期望之间进行了良好的比较。我们发现，在iOffe-time，$ν\ lyssim 9 $的范围内，从模型独立于gluon螺旋性伪分布的质子旋转贡献的非零Gluon自旋贡献提示。
We present the first exploratory lattice quantum chromodynamics (QCD) calculation of the polarized gluon Ioffe-time pseudo-distribution in the nucleon. The Ioffe-time pseudo-distribution provides a frame-independent and gauge-invariant framework to determine the gluon helicity in the nucleon from first principles. We employ a high-statistics computation using a $32^3\times 64$ lattice ensemble characterized by a $358$ MeV pion mass and a $0.094$ fm lattice spacing. We establish the pseudo-distribution approach as a feasible method to address the proton spin puzzle with successive improvements in statistical and systematic uncertainties anticipated in the future. Within the statistical precision of our data, we find a good comparison between the lattice determined polarized gluon Ioffe-time distribution and the corresponding expectations from the state-of-the-art global analyses. We find a hint for a nonzero gluon spin contribution to the proton spin from the model-independent extraction of the gluon helicity pseudo-distribution over a range of Ioffe-time, $ν\lesssim 9$.
