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

Abstract

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 text][Formula: see text]GeV at very forward angles and behaviors within the range of [Formula: see text][Formula: see text]GeV. Furthermore, in the region with [Formula: see text][Formula: see text]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 [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 fb[Formula: see text] per month.