Study on the ϕ-meson photoproduction off the proton target with the pentaquark-like K∗Σ bound state Ps

In this paper, we utilize the effective Lagrangian method within the tree-level Born approximation to explore Formula: see text-meson photoproduction, i.e. Formula: see text. Our analysis encompasses contributions from various sources, including the Pomeron, Formula: see text-Regge, pseudoscalar particles (Formula: see text, Formula: see text), scalar particles (Formula: see text, Formula: see text), protons, and three-nucleon resonance states. In addition, we consider a possible pentaquark-like Formula: see text-bound state Formula: see text. 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, alternative contributions become crucial at specific angles, particularly at smaller values of Formula: see text. The incorporation of Formula: see text and other nucleon resonances proves essential to elucidate the bump observed near Formula: see textFormula: see textGeV at very forward angles and behaviors within the range of Formula: see textFormula: see textGeV. Furthermore, in the region with Formula: see textFormula: see textGeV, 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 Formula: see text. We also briefly estimate the Formula: see text production via Formula: see text-meson photoproduction in the future Electron-Ion Collider (EIC), resulting in the luminosity of 10 fbFormula: see text per month.