Omega and Eta (Eta-prime) mesons from NN and ND collisions at intermediate energies

Abstract

The production of pseudo scalar, Eeta, Eta-prime, and vector, Omega, Rho, Phi, mesons in NN collisions at threshold-near energies is analyzed within a covariant effective meson-nucleon theory. It is shown that a good description of cross sections and angular distributions, for vector meson production, can be accomplished by considering meson and nucleon currents only, while for pseudo scalar production an inclusion of nucleon resonances is needed. The di-electron production from subsequent Dalitz decay of the produced mesons, ${\eta }^{\prime }\to \gamma {\gamma }^{\ast }\to \gamma e^{+}{e}^{-}$ and $\omega \to \pi {\gamma }^{\ast }\to \pi e^{+}{e}^{-}$ is also considered and numerical results are presented for intermediate energies and kinematics of possible experiments with HADES, CLAS and KEK-PS. We argue that the transition form factor $\omega \to {\gamma }^{\ast }\pi$ as well as ${\eta }^{\prime }\to {\gamma }^{\ast }\gamma$ can be defined in a fairly model independent way and the feasibility of an experimental access to transition form factors is discussed.

Presented at the International Conference on Nuclear Reactions on Nucleons and Nuclei, Oct. 5-10, 2009, Messina, Italy

References in corpus (9)

• Di-Electron Bremsstrahlung in Intermediate-Energy pn and Dp Collisions
• The Near-Threshold Production of Phi Mesons in pp Collisions
• Production of $\omega$ mesons in proton-proton collisions
• Combined Analysis of Near-Threshold Production of omega and phi Mesons in Nucleon-Nucleon Collisions within an Effective Meson-Nucleon Model
• Near threshold production of the eta meson via the quasi-free pn --> pn eta reaction
• Study of omega-meson production in pp collisions at ANKE
• eta-prime Meson Production in Nucleon-Nucleon Collisions Near The Threshold
• $\omega -\pi {\gamma }^{\ast }$ transition form factor in proton-proton collisions
• Di-electrons from $\eta$ meson Dalitz decay in proton-proton collisions

Cited by in corpus (1)

• Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES