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arXiv 2209.00403hep-ph
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重夸克对核子电磁性质的贡献

Heavy quark contribution to the electromagnetic properties of the nucleon

Stanley J. Brodsky, Valery E. Lyubovitskij, Ivan Schmidt

备注：
8 pages, 8 figures
发表信息：
Phys. Rev. D 106, 094025 (2022)
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摘要：

量子色动力学（QCD）预言了非微扰的内禀重夸克和微扰的外禀重夸克对强子基本结构的贡献。在质子的3-标准偏差水平的存在的内在魅力最近已经建立了由NNPDF合作的结构功能测量。本文利用光阵面全息QCD（LFHQCD）方法重新研究了内禀重夸克的物理性质。LFHQCD方法是一种研究强子结构的新方法，它对强子的动力学性质，如形状因子、分布振幅、结构函数等提供了详细的预言。我们的框架是基于QCD光阵面哈密顿量的本征函数的研究，框架无关的光阵面波函数（LFWFs）的强子动力学。我们分析了质子中的重夸克含量，它是由非微扰的$|uud+Q\bar Q\rangle$ Fock态或由$|uud+g\rangle$ Fock态直接引起的，在这种状态下胶子分裂成重夸克-反夸克对。这些LFWF的具体形式源自LFHQCD。利用这些LFWF，我们构造了重夸克-反夸克不对称性的光阵面表示，重夸克诱导的核子的电磁形状因子，包括它们的磁矩和半径。

英文摘要：

Quantum chromodynamics (QCD) predicts the existence of both nonperturbative intrinsic and perturbative extrinsic heavy quark contributions to the fundamental structure of hadrons. The existence of intrinsic charm at the 3-standard-deviation level in the proton has recently been established from structure function measurements by the NNPDF Collaboration. Here we revisit the physics of intrinsic heavy quarks using light-front holographic QCD (LFHQCD) - a novel comprehensive approach to hadron structure which provides detailed predictions for dynamical properties of the hadrons, such as form factors, distribution amplitudes, structure functions, etc. We will extend this nonperturbative light-front QCD approach to study the heavy quark-antiquark contribution to the electromagnetic properties of nucleon. Our framework is based on a study of the eigenfunctions of the QCD light-front Hamiltonian, the frame-independent light-front wave functions (LFWFs) underlying hadron dynamics. We analyze the heavy quark content in the proton, induced either directly by the nonperturbative $|uud+Q\bar Q\rangle$ Fock state or by the $|uud+g\rangle$ Fock state, where the gluon splits into a heavy quark-antiquark pair. The specific form of these LFWFs are derived from LFHQCD. Using these LFWFs, we construct light-front representations for the heavy quark-antiquark asymmetry, the electromagnetic form factors of nucleons induced by heavy quarks, including their magnetic moments and radii.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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