Differential cross section of $\mathit{\varphi }$-meson photoproduction at threshold

We show that the differential cross section $d\sigma /\mathit{dt}$ of the $\gamma p\to \varphi p$ reaction at threshold is finite and its value is crucial to the mechanism of ϕ-meson photoproduction and for the models of $\varphi N$ interaction.

Figure 1

Differential cross section of the $\gamma p\to \varphi p$ reaction at $\theta =0$ as a function of the photon energy. The enumerated symbols “plus” correspond to the threshold predictions, given in Eq. (6) and Eqs. (9, 10, 11). Experimental data are taken from Refs. [9, 18].

Figure 2

Diagrammatic presentation of the pseudoscalar $\pi ,\eta$ exchange processes in the $\gamma p\to \varphi p$ reaction.