Photoproduction of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ω</mml:mi></mml:math>meson on the proton near threshold

Abstract

An experimental study of $\ensuremath{\omega}$ 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 $\ensuremath{\gamma}p\ensuremath{\rightarrow}\ensuremath{\omega}p$ differential cross sections are measured from threshold to the incident-photon energy ${E}_{\ensuremath{\gamma}}=1.40$ GeV $(W=1.87$ GeV for the center-of-mass energy) with 15-MeV binning in ${E}_{\ensuremath{\gamma}}$ 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 $\ensuremath{\omega}N$ scattering length ${\ensuremath{\alpha}}_{\ensuremath{\omega}p}$ is provided.