Photoproduction of the $\omega$ meson off the proton near threshold

TL;DR

This paper reports on the measurement of omega meson photoproduction off protons near threshold energies, providing detailed differential cross sections and insights into omega-nucleon interactions.

Contribution

It presents new high-precision differential cross section data for gamma p to omega p near threshold, enabling better understanding of omega meson production and interactions.

Findings

Differential cross sections measured from threshold to 1.40 GeV photon energy.

Full angular coverage achieved in the measurements.

Estimation of the omega-nucleon scattering length.

Abstract

An experimental study of $\omega$ photoproduction on the proton was conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The $\gamma p\to\omega p$ differential cross sections are measured from threshold to the incident-photon energy $E_\gamma=1.40$ GeV ($W=1.87$ GeV for the center-of-mass energy) with 15-MeV binning in $E_\gamma$ and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics aspects. As an example, an estimation of the $\omega N$ scattering length $\alpha_{\omega p}$ is provided.