EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 13, 355-362 (2002)

$\mth{\omega}$-meson photoproduction on nucleons in the near-threshold region

H. Babacan, T. Babacan, A. Gokalp and O. Yilmaz

Physics Department, Middle East Technical University, 06531 Ankara, Turkey

oyilmaz@metu.edu.tr

(Received: 10 October 2001 / Revised version: 11 December 2001 Communicated by V.V. Anisovich)

Abstract
The $\omega$-meson photoproduction, $\gamma+p\rightarrow p+\omega$ , is studied in the framework of a model, containing $\pi$-meson exchange in t-channel and nucleon-exchange in s- and u-channels. Considering both $\omega NN$ coupling constants in the region of time-like meson four-momenta as the free parameters, we find different sets of solutions for these constants from the existing data on the t-dependence of the differential cross-sections, $ \drm \sigma(\gamma+p\rightarrow p+\omega)/ \drm t$ , in the near-threshold region $E_{\gamma}\leq 2$ GeV. These sets of $\omega NN$ coupling constants, corresponding to destructive and constructive $\pi\otimes N$ -interference contributions to $ \drm \sigma/ \drm t$ can be well distinguished by measurements of beam asymmetry, induced by linear photon polarization.

PACS
13.60.Le - Meson production.
13.88.+e - Polarization in interactions and scattering.
24.70.+s - Polarization phenomena in reactions.
25.20.Lj - Photoproduction reactions.

© Società Italiana di Fisica, Springer-Verlag 2002

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