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arXiv 2107.03488hep-phhep-exhep-latnucl-exnucl-th
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矢量介子产生与矢量介子主导

Vector-meson production and vector meson dominance

Yin-Zhen Xu, Si-Yang Chen, Zhao-Qian Yao, Daniele Binosi, Zhu-Fang Cui, Craig D. Roberts

AI总结:

本文评估了矢量介子主导(VMD)假设在关联电磁与纯强子矢量介子产生过程中的适用性,发现其适用于轻矢量介子但对重矢量介子失效,建议重新审查涉及重介子过程的基于VMD的截面估计与结论。

摘要:

我们考察了矢量介子主导(VMD)假设作为将电磁矢量介子产生反应 $e + p \to e^\prime + V + p$ 与纯强子过程 $V + p \to V+p$ 联系起来的工具的保真度。对光子真空极化和光子-夸克顶点的分析表明,这种 VMD Ansatz 对于轻矢量介子可能是合理的。然而,当矢量介子由动量依赖的束缚态振幅描述时,VMD 对于重矢量介子会失效:它无法可靠地估计光子到矢量介子的跃迁强度,也无法估计在计算不同反应振幅时出现的那些积分项的动量依赖性。因此,对于涉及重介子的过程,应重新审查基于 VMD 假设的截面估计和结论的准确性,例如与隐粲五夸克态产生和质子质量起源相关的结论。

英文摘要:

We consider the fidelity of the vector meson dominance (VMD) assumption as an instrument for relating the electromagnetic vector-meson production reaction $e + p \to e^\prime + V + p$ to the purely hadronic process $V + p \to V+p$. Analyses of the photon vacuum polarisation and the photon-quark vertex reveal that such a VMD Ansatz might be reasonable for light vector-mesons. However, when the vector-mesons are described by momentum-dependent bound-state amplitudes, VMD fails for heavy vector-mesons: it cannot be used reliably to estimate either a photon-to-vector-meson transition strength or the momentum dependence of those integrands that would arise in calculations of the different reaction amplitudes. Consequently, for processes involving heavy mesons, the veracity of both cross-section estimates and conclusions based on the VMD assumption should be reviewed, e.g., those relating to hidden-charm pentaquark production and the origin of the proton mass.

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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