$\phi$ photoproduction on the proton at $E_{\gamma}$ = 1.5 - 2.9 GeV

TL;DR

This study measures differential cross sections and decay asymmetries for $\

Contribution

It provides new experimental data on $\

Findings

Cross sections are well described by the Pomeron and pseudoscalar exchange model above 2.37 GeV.

An excess in cross sections at lower energies suggests additional processes near threshold.

The Pomeron strength factor was determined from the data.

Abstract

Differential cross sections at $t=t_{\text{min}}$ and decay asymmetries for the $\gamma p\rightarrow\phi p$ reaction have been measured using linearly polarized photons in the range 1.5 to 2.9 GeV. These cross sections were used to determine the Pomeron strength factor. The cross sections and decay asymmetries are consistently described by the $t$-channel Pomeron and pseudoscalar exchange model in the $E_{\gamma}$ region above 2.37 GeV. In the lower energy region, an excess over the model prediction is observed in the energy dependence of the differential cross sections at $t=t_{\text{min}}$. This observation suggests that additional processes or interference effects between Pomeron exchange and other processes appear near the threshold region.