A meson-exchange model of the associated photoproduction of vector mesons and N*(1440) resonances

Abstract

We discuss the photoproduction of omega- and rho0-mesons off protons in the particular channel where the target proton is excited to a Roper resonance N*(1440). We propose a simple meson-exchange model for these processes in order to evaluate their cross sections near threshold and at low momentum transfers. It is suggested in particular that the differential cross section for the associated photoproduction of a rho0-meson and a Roper resonance in these kinematic conditions could provide direct information on the strength of the scalar-isoscalar excitation of the N*(1440) and hence on the magnitude of an effective sigma N N*(1440) coupling. The latter quantity is poorly known and of much interest for the nuclear many-body problem.

18 pages, 9 figures, accepted for publication in Nuclear Physics A

Cited by in corpus (9)

• Quark-model study of few-baryon systems
• The two pion decay of the Roper resonance
• Nuclear response functions for the N-N*(1440) transition
• Di-Electrons from Resonances in Nucleon-Nucleon Collisions
• The decay ${\rho }^0\to {\pi }^{+}+{\pi }^{-}+\gamma$ and the coupling constant g${}_{\rho \sigma \gamma }$
• Short-range three-nucleon forces and low-energy constants
• Microscopic $NN\to N{N}^{\ast }(1440)$ transition potential: Determination of $\pi N{N}^{\ast }(1440)$ and $\sigma N{N}^{\ast }(1440)$ coupling constants
• Determination of the $g_{\rho \sigma \gamma }$ coupling constant through the process $\gamma +N\to N+V$ with circularly polarized photons
• Assocative Photoproduction of Roper Resonance and $\omega$-Meson