Szczegóły publikacji

We discuss the exclusive production of \(\eta \) meson in proton–proton collisions in order to learn about the relevant production mechanism at the GSI-FAIR energies. The nucleon and baryonic-resonance amplitudes are derived within an effective Lagrangian approach. Assuming that for the \(pp \to pp \eta \) reaction the dominant contribution is due to an excitation of \(N(1535)\) via the \(\rho ^{0}\) exchange, the present model reproduces data for both total and differential cross sections, for instance, the distributions of the polar angle of the \(\eta \) meson in the center-of-mass system. The role of vector-meson-fusion processes \(\omega \omega , \rho ^{0} \rho ^{0} \to \eta \) is specified. Comparisons with currently existing data from the DISTO and HADES experiments are made, and predictions for higher energies (HADES, PANDA, SIS100) are given.

Published by the Jagiellonian University2025authors

We discuss the exclusive production of \(\eta \) meson in proton–proton collisions in order to learn about the relevant production mechanism at the GSI-FAIR energies. The nucleon and baryonic-resonance amplitudes are derived within an effective Lagrangian approach. Assuming that for the \(pp \to pp \eta \) reaction the dominant contribution is due to an excitation of \(N(1535)\) via the \(\rho ^{0}\) exchange, the present model reproduces data for both total and differential cross sections, for instance, the distributions of the polar angle of the \(\eta \) meson in the center-of-mass system. The role of vector-meson-fusion processes \(\omega \omega , \rho ^{0} \rho ^{0} \to \eta \) is specified. Comparisons with currently existing data from the DISTO and HADES experiments are made, and predictions for higher energies (HADES, PANDA, SIS100) are given.

Published by the Jagiellonian University2025authors