A Theoretical Study of $ρ^{0}$-Photoproduction on Nucleons near Threshold

Details A Theoretical Study of $ρ^{0}$-Photoproduction on Nucleons near Threshold A Theoretical Study of $ρ^{0}$-Photoproduction on Nucleons near Threshold

2001-07-25

arxiv.org/abs/nucl-th/0107063v1

Acta Phys.Polon. B33 (2002) 683-698

Physics

Nuclear Physics

Nuclear Theory

21 pages, RevTex, 6 PS figures

Scientific paper

We investigate the possibility that the process of $\rho^{0}$-meson photoproduction on proton, $\gamma+p\to p+\rho^{0}$, in the near threshold region $E_{\gamma}< 2$ GeV, can be considered in the framework of model with $\pi$-, $\sigma$- and N-exchanges. This suggestion is based on a study of the t-dependence of differential cross section, $d\sigma(\gamma p \to p \rho^{0})/dt$, which has been measured by SAPHIR Collaboration. We find that the suggested model provides a good description of the experimental data with new values of $\rho NN$-coupling constants in the region of the time-like $\rho^{0}$-meson momentum. Our results suggest that such model can be considered as a suitable nonresonant background mechanism for the future discussion of possible role of nucleon resonance contributions. Our predictions for $\rho^{0}$-meson photoproduction on neutron target and for beam asymmetry on both proton and neutron targets are presented.

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