论文标题
质子的质量半径和机械性能通过奇怪的$ ϕ $ MESON光生效
Mass radius and mechanical properties of the proton via strange $ϕ$ meson photoproduction
论文作者
论文摘要
在这项工作中，使用两个Gluon交换模型和Pomeron模型系统地研究了$ ϕ $光增生的横截面。获得的结果表明，这两个模型的理论值与实验数据非常吻合。由于质子的质量半径和机械性能是根据动量能量张量的标量重力形式编码的，基于两个Gluon Exchange模型所预测的$ ϕ $光增生的差异横截面，因此Proton的平均质量半径是$ \ sqrt feed the thers。 r^{2} \ right \ rangle_ \ mathrm {m}} = 0.78 \ pm 0.06 $ fm。作为比较，我们直接从$ ϕ $光生生效的实验数据中直接提取质子质量半径，以获得$ 0.80 \ pm0.05 $ fm的平均值，这非常接近两个Gluon Exchange模型给出的结果。采用类似的方法，我们提取了$ m_ {d} $的平均值，以获得质子内贡献的压力和剪切力的分布，并将结果与其他组进行了比较。本文的结果可能会为随后对质子的内部结构和特性的深入研究提供必要的理论信息。
In this work, the cross sections of $ϕ$ photoproduction are systematically investigated with the two gluon exchange model and the pomeron model. The results obtained show that the theoretical values of the two models agree well with the experimental data. Since the mass radius and mechanical properties of the proton are encoded in the scalar gravitational form factor of the momentum energy tensor, based on the differential cross sections of $ϕ$ photoproduction at near-threshold predicted by the two gluon exchange model, the average mass radius of the proton is derived as $\sqrt{\left\langle r^{2}\right\rangle_\mathrm{m} }=0.78 \pm 0.06$ fm. As a comparison, we directly extract the proton mass radius from the experimental data of $ϕ$ photoproduction to obtain an average value of $0.80\pm0.05$ fm, which is very close to the result given by the two gluon exchange model. Taking a similar approach, we extracted the average value of $m_{D}$ to obtain the distribution of the pressure and shear force contributed within the proton, and compared the results with other groups. The results of this paper may provide necessary theoretical information for the subsequent in-depth study of the internal structure and properties of proton.
