QCD运行耦合0 （am）改进的微扰确定

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

Physical Review D Pub Date : 2025-10-17 DOI:10.1103/yyvs-6q5v

M. Costa, D. Gavriel, H. Panagopoulos, G. Spanoudes

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引用次数: 0

摘要

在晶格微扰理论中，我们给出了QCD运行耦合中与夸克质量成正比的离散误差[O(am)]的扰动结果。我们的分析包括使用改进的晶格作用计算具有有限夸克质量的费米子的SU（Nc）规范群和Nf多重态的双环重整化因子Zg。我们采用背景场法计算Zg，通过计算背景和量子胶子传播子上的量子修正，考虑到O(a)的改进。这使我们能够评估影响运行耦合确定的摄动O（am）晶格误差。消除这些O（am）效应对于利用晶格场理论精确确定强耦合常数的非摄动研究至关重要。

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Perturbative determination of O(am) improvement on the QCD running coupling

We present the perturbative results of the discretization errors proportional to the quark mass [O(am)] on the QCD running coupling within lattice perturbation theory. Our analysis involves calculating the two-loop renormalization factor Zg using improved lattice actions for the SU(Nc) gauge group and Nf multiplets of fermions with a finite quark mass. We employ the background field method to compute Zg, by calculating quantum corrections on both the background and quantum gluon propagator, respecting the O(a) improvement. This allows us to evaluate the perturbative O(am) lattice errors which affect the determination of the running coupling. Eliminating these O(am) effects is crucial for the nonperturbative studies of precision determinations of the strong coupling constant using lattice field theory.

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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.