网格 QCD 中四点函数的中性极化率

IF 2.5 3区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

Nuclear Physics B Pub Date : 2024-09-26 DOI:10.1016/j.nuclphysb.2024.116701

Frank X. Lee , Walter Wilcox , Andrei Alexandru , Chris Culver , Shayan Nadeem

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引用次数: 0

摘要

我们报告了用四点函数法对中性先驱的电极化率和磁极化率进行的格子 QCD 模拟的原理验证。这些结果基于之前用于带电先驱的相同的淬火威尔逊集合，该集合位于 β=6.0 的 243×48 晶格上，先驱质量为 1100 至 370 MeV。在电极化率方面，结果与背景场法和 ChPT 的结果基本一致。相反，在磁极化率方面，四点函数法、背景场法和 ChPT 的结果有很大差异。这种情况说明了断开图对于中性先驱的重要作用。我们阐明了四点函数法中的透明夸克分解，可以用来揭示这个问题。

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Neutral pion polarizabilities from four-point functions in lattice QCD

We report a proof-of-principle lattice QCD simulation of the electric and magnetic polarizabilities for a neutral pion in the four-point function method. The results are based on the same quenched Wilson ensembles on a

24^{3} \times 48

lattice at

β = 6.0

with pion mass from 1100 to 370 MeV previously used for a charged pion. For electric polarizability, the results are largely consistent with those from the background field method and ChPT. In contrast, there are significant differences for magnetic polarizability among the four-point function method, the background field method, and ChPT. The situation points to the important role of disconnected diagrams for a neutral pion. We elucidate a transparent quark decomposition in the four-point function method that can be used to shed light on the issue.

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来源期刊

Nuclear Physics B 物理-物理：粒子与场物理

CiteScore

5.50

自引率

7.10%

发文量

302

审稿时长

1 months

期刊介绍： Nuclear Physics B focuses on the domain of high energy physics, quantum field theory, statistical systems, and mathematical physics, and includes four main sections: high energy physics - phenomenology, high energy physics - theory, high energy physics - experiment, and quantum field theory, statistical systems, and mathematical physics. The emphasis is on original research papers (Frontiers Articles or Full Length Articles), but Review Articles are also welcome.