标题： 研究质子靶上通过五夸克类束缚态$K^*Σ$的$φ$-介子光致产生及$P_s$ 显示英文标题

标题： Study on the $φ$-meson photoproduction off the proton target with the pentaquark-like $K^*Σ$ bound state $P_s$

摘要： 我们利用有效拉格朗日方法在树图Born近似下研究了$\phi$介子的光致产生，即$\gamma p \to \phi p$。 我们的分析涵盖了来自各种来源的贡献，包括Pomeron（庞加莱），$f_1$-Regge（雷杰），赝标粒子（$\pi$，$\eta$），标量粒子（$a_0$，$f_0$），质子以及三核共振态。 此外，我们考虑了一个可能的五夸克态类似的$K^* \Sigma$-束缚态$P_s$。 研究结果表明，除了接近阈值的区域外，除杨振子之外的其他贡献对总截面的影响有限。 然而，在特定角度下，替代性贡献变得至关重要，特别是在较小的${\rm cos}\,\theta$值时。 纳入$P_s$和其他核共振证明对于阐明在非常前向角附近观测到的接近$W \sim 2.15$GeV 的隆起以及$W=(2.0-2.3)$GeV 范围内的行为至关重要。 此外，在核共振变得可以忽略的$W\ge 2.5$GeV 区域，t 通道介子的贡献变得至关重要。 我们在不同参考系中检查的自旋密度矩阵分量的计算结果显示，考虑所有贡献时有所改进。 这种方法成功地通过引入$P_s$复现了观测到的凸起。我们还简要估计了$P_s$在未来电子-离子对撞机（EIC）上的产生，通过$\phi$介子光致产生，每月的亮度可达 10 fb$^{-1}$。 显示英文摘要

摘要： We utilize the effective Lagrangian method within the tree-level Born approximation to explore $\phi$-meson photoproduction, i.e., $\gamma p \to \phi p$. Our analysis encompasses contributions from various sources, including the Pomeron, $f_1$-Regge, pseudoscalar particles ($\pi$, $\eta$), scalar particles ($a_0$, $f_0$), protons, and three-nucleon resonance states. In addition, we consider a possible pentaquark-like $K^* \Sigma$-bound state $P_s$. The findings indicate that, apart from the region near the threshold, contributions other than the Pomeron generally have a limited impact on the total cross section. However, at specific angles, alternative contributions become crucial, particularly at smaller values of ${\rm cos}\,\theta$. The incorporation of $P_s$ and other nucleon resonances proves essential to elucidate the bump observed near $W \sim 2.15$ GeV at very forward angles and behaviors within the range of $W=(2.0-2.3)$ GeV. Furthermore, in the region with $W\ge 2.5$ GeV, where nucleon resonances become negligible, contributions from the t-channel mesons become pivotal. Our calculations for spin density matrix components, examined in various frames, exhibit improvement when considering all contributions. This comprehensive approach successfully reproduces the observed bump by including $P_s$. We also briefly estimate the $P_s$ production via $\phi$-meson photoproduction in the future Electron-Ion Collider (EIC), resulting in the luminosity of 10 fb$^{-1}$ per month.