Determination of the $g_{ρσγ}$ coupling constant through the process $γ+N\to N+V$ with circularly polarized photons

Details Determination of the $g_{ρσγ}$ coupling constant through the process $γ+N\to N+V$ with circularly polarized photons Determination of the $g_{ρσγ}$ coupling constant through the process $γ+N\to N+V$ with circularly polarized photons

2002-08-19

arxiv.org/abs/hep-ph/0208174v1

Nucl.Phys. A714 (2003) 632-640

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures

Scientific paper

10.1016/S0375-9474(02)01403-3

We suggest a method to determine the product of the coupling constants $g_{\rho\sigma\gamma}g_ {\sigma NN}$, in absolute value and relative sign, through the $t$-dependence of the two possible T-even asymmetries for the photoproduction of vector mesons, $\gamma+p\to p+V^0$, $V^0=\rho$ or $\omega$, in the collision of circularly polarized photons with a polarized proton target. In the framework of a $\pi+\sigma$-model, these asymmetries are very sensitive to the relative role of $\pi$- and $\sigma$-exchanges, in the near threshold region.

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