论文标题
基于载体炭的光生源对质子质量半径的系统分析
Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums
论文作者
论文摘要
在这项工作中，研究了从生产阈值到中等能量的反应$γp\ Rightarrow V（J/ψ，ψ（2s））P $的横截面，并在两个Gluon交换模型中进行了系统的分析。获得的数值结果与实验数据和其他理论预测一致。在偶极子形式的标量形式的假设下，质子质量半径的值分别为$ 0.55 \ pm 0.09 $ fm和$ 0.77 \ pm 0.12 $ fm，从拟合到预测的$ j/ψ$和$ j/ψ$和$ψ$和$ψ（2S）$差异横截面。最后，质子质量半径的平均值估计为$ \ sqrt {\ left <r^2_m \ right>} = 0.67 \ pm 0.11 $ fm。此外，人们发现，从近距离的码头横截面中提取质量半径始终会受到大$ | t | _ {min} $的影响。这些获得的结果可能会为理解核子结构和未来相关实验提供重要的理论参考。
In this work, the cross-section of the reaction $γp \rightarrow V(J/ψ,ψ(2S)) p$ from the production threshold to medium energy is studied and systematically analyzed within two gluon exchange model. The obtained numerical results are in agreement with experimental data and other theoretical predictions. Under the assumption of the scalar form factor of dipole form, the value of proton mass radius is calculated as $0.55\pm 0.09$ fm and $ 0.77\pm 0.12$ fm from the fit to the predicted $J/ψ$ and $ψ(2S)$ differential cross-section, respectively. Finally the average value of proton mass radius is estimated to be $\sqrt{\left<R^2_m \right>}=0.67\pm 0.11$ fm. Moreover, one find that extracting mass radius from the near-threshold differential cross-section of heavy quarkoniums is always affected by large $|t|_{min}$. These obtained results may provide important theoretical reference for understanding of nucleon structure and future relevant experiments.
