Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-08-04
Physics
Nuclear Physics
Nuclear Theory
7 pages, talk at International Symposium on Electrophoto-production of Strangeness on Nucleons and Nuclei (SENDAI03), June 16-
Scientific paper
The $\sigma$ meson exchange model for $\rho$ photoproduction at low energies is re-examined and a new model is developed by considering explicit two-pion exchange and the $f_2$ tensor meson exchange. The $f_2$ exchange model, which is motivated by the low energy proton-proton elastic scattering, is constructed by fully taking into account of the tensor structure of the $f_2$ meson interactions. Phenomenological informations together with tensor meson dominance and vector meson dominance assumptions are used to estimate the $f_2$ meson's coupling constants. For $2\pi$ exchange, the loop terms including intermediate $\pi N$ and $\omega N$ channels are calculated using the coupling constants determined from the study of pion photoproduction. It is found that our model with $f_2$ and $2\pi$ exchanges can successfully replace the commonly used $\sigma$ exchange model that suffers from the big uncertainty of the coupling constants. We found that the two models can be distinguished by examining the single and double spin asymmetries.
Lee T. S. -H.
Oh Yongseok
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