Nucleon tensor form factors at large Nc

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-04-18 DOI:10.1103/physrevd.111.074024

Nam-Yong Ghim, Ho-Yeon Won, June-Young Kim, Hyun-Chul Kim

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引用次数: 0

Abstract

We investigate nucleon tensor form factors in the large-Nc limit. In this picture, the nucleon emerges as a state of the Nc valence quarks, which were bound by pion mean fields that were created by the presence of the valence quarks self-consistently. We find that the tensor charge (gTu−d=0.99) and the anomalous tensor magnetic moment (κTu+d=7.61) are dominated by valence quarks, while the tensor quadrupole moment (QTu−d=−7.02) shows significant sea quark effects. We examine how these quantities vary as the average size of the pion mean field is changed, showing interpolation between nonrelativistic quark and Skyrme limits. We also observe that gTu−d and κTu+d depend weakly on the pion mass. In contrast, QTu−d exhibits strong enhancement near the chiral limit. The numerical results are in good agreement with available lattice quantum chromodynamics (QCD) data and provide predictions for unmeasured quantities.

Published by the American Physical Society

2025

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核子张量形式因子在大Nc

我们研究了大nc极限下的核子张量形式因子。在这幅图中，核子以Nc价夸克的状态出现，它们被介子平均场束缚，而介子平均场是由价夸克自一致的存在所产生的。我们发现张量电荷（gTu−d=0.99）和异常张量磁矩（κTu+d=7.61）以价夸克为主，而张量四极矩（QTu−d=−7.02）表现出明显的海夸克效应。我们研究了这些量是如何随着介子平均场的平均大小的变化而变化的，显示了非相对论性夸克和Skyrme极限之间的插值。我们还观察到gTu - d和κTu+d对介子质量的依赖性较弱。相比之下，QTu−d在接近手性极限时表现出很强的增强。数值结果与现有的晶格量子色动力学（QCD）数据吻合良好，并为未测量量提供了预测。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.