Beam asymmetry in near threshold omega photoproduction off the proton
Frank Klein et al. (The CBELSA/TAPS Collaboration)
TL;DR
This study measures the beam asymmetry in near-threshold omega photoproduction off protons, revealing large photon asymmetries and s-channel resonance indications, advancing understanding of meson production mechanisms.
Contribution
It provides new experimental data on polarization asymmetries in omega photoproduction near threshold energies, highlighting resonance contributions.
Findings
Photon asymmetries exceed 50% near threshold
Asymmetries depend on Theta_{cm} rather than |t|
Evidence for s-channel resonance formation
Abstract
The photoproduction of omega mesons off protons has been studied at the Bonn ELSA accelerator from threshold to E_gamma = 1700 MeV. Linearly polarized beams were produced via coherent bremsstrahlung. Large photon asymmtries in excess of 50% were obtained, whereas the pion asymmetries from omega \to pi^0 gamma are close to zero. The asymmetries do characteristically depend on Theta_{cm} rather than |t| and indicate s-channel resonance formation on top of t-channel exchange processes.
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