高统计量的2+1+1晶格QCD的介子胶子分布和动量分数

IF 5.3 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-10-14 DOI:10.1103/89mq-gx33

Alex NieMiera, William Good, Huey-Wen Lin

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引用次数: 0

摘要

我们提出了一种高统计量的格子- qcd方法来测定介子胶子分子分布函数和胶子动量分数。我们利用三叶草价费米子作用对由MILC协作产生的具有≈0.12fm和310 mev介子质量的高度改进的交错夸克系综进行了1,296,640个介子相关测量。对测量链路涂抹对胶子矩阵元素影响的详细研究表明，超立方涂抹的五个步骤在信号质量和远距离物理保存之间提供了有效的平衡。我们在MS¯方案中报告了⟨x⟩gMS¯，K=0.557(18)stat(24)NPR（56）在μ=2 GeV处混合的非微扰重整化的kaon胶子动量分数。利用简化的伪约offe-time-distribution矩阵元素和伪parton-distribution-function （PDF）匹配，我们提取了k介子胶子的PDF，并与Dyson-Schwinger方程的预测和同一系集合的介子PDF进行了比较。

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Kaon gluon parton distribution and momentum fraction from 2+1+1 lattice QCD with high statistics

We present a high-statistics lattice-QCD determination of the kaon gluon parton distribution function and gluon momentum fraction. We use clover valence fermion action to take 1,296,640 kaon-correlator measurements on a highly improved staggered quark ensemble with a≈0.12fm and 310-MeV pion mass generated by the MILC Collaboration. A detailed investigation into the impact of gauge-link smearing on the gluonic matrix elements indicates that five steps of hypercubic smearing offer an effective balance between signal quality and preservation of long-distance physics. We report a nonperturbatively renormalized kaon gluon momentum fraction of ⟨x⟩gMS¯,K=0.557(18)stat(24)NPR(56)mixing at μ=2 GeV in the MS¯ scheme. Using reduced pseudo-Ioffe-time-distribution matrix elements and pseudo-parton-distribution-function (PDF) matching, we extract the kaon gluon PDF and compare with the prediction from the Dyson-Schwinger equation and with the pion PDF obtained from the same ensemble.

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.