论文标题
基于光矢量中子光生生产的痕量异常对质子质量的贡献的探索
Exploration of trace anomaly contribution to proton mass based on light vector meson photoproduction
论文作者
论文摘要
在量子染色体动力学中，质子的质量来源通过能量动量张量分解为四个部分：夸克能项，gluon能量项，夸克质量项和痕量异常项。痕量异常项是研究质子内部结构的最关键贡献。在这项工作中，在矢量中介孔主导模型的定义下，质子的痕量异常贡献是从光线媒介中的实验数据中提取的，$ρ$，$ω$和$ ϕ $ photodroduction在接近threshold，thes-Threshold（$ 1.15 \ pm0.08 $ $ \％$ \ pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm pm， （$ 5.58 \ pm0.25 $）分别$ \％$。最终，质子的平均痕量异常贡献为（$ 4.36 \ pm0.40 $）$ \％$，仅占质子总质量的一小部分。这项工作的结果将提供理论信息支持，以进一步研究质子内部结构。
In the quantum chromodynamics, the mass source of the proton is decomposed into four parts by the energy momentum tensor : quark energy term, gluon energy term, quark mass term and trace anomaly term. And the trace anomaly term is the most crucial contribution for studying the internal structure of the proton. In this work, under the definition of the vector meson dominant model, the trace anomaly contribution of the proton is extracted from the experimental datas of light vector mesons $ρ$, $ω$ and $ϕ$ photoproduction at the near-threshold, which are ($1.15\pm0.08$)$\%$, ($2.70\pm0.04$)$\%$ and ($5.58\pm0.25$)$\%$, respectively. Eventually, the average trace anomaly contribution of the proton is ($4.36\pm0.40$) $\%$, which only account for a small fraction of the total proton mass. The result of this work will provide theoretical information support for further study of proton internal structure.
