Photoproduction of the $\omega$ meson off the proton near threshold
  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. 
I. I. Strakovsky, S. Prakhov, Y. I. Azimov, P. Aguar-Bartolome, J. R.   M. Annand, H. J. Arends, K. Bantawa, R. Beck, V. Bek...
nucl-ex hep-ex hep-ph