$\phi$ photoprodution with coupled-channel effects

TL;DR

This paper investigates phi photoproduction near threshold energies, demonstrating that hadronic rescattering effects, especially K Lambda(1520), explain experimental data and spin observables.

Contribution

It introduces a comprehensive coupled-channel model including hadronic rescattering effects to explain phi photoproduction data near threshold.

Findings

Hadronic box diagrams explain the bump at 2.3 GeV photon energy.

K Lambda(1520) rescattering dominates the intermediate state.

Model aligns with observed spin-density matrix elements.

Abstract

We study phi photoproduction with various hadronic rescattering contributions included, in addition to the Pomeron and pseudoscalar meson-exchange diagrams. We find that the hadronic box diagrams can explain the recent experimental data in the vicinity of the threshold. In particular, the bump-like structure at the photon energy E_gamma \approx 2.3$ GeV is well explained by the K Lambda(1520) rescattering amplitude in the intermediate state, which is the dominant contribution among other hadronic contributions. We also find that the hadronic box diagrams are consistent with the observed spin-density matrix elements near the threshold region.