A phenomenological model with N(1535) dominance and rho-exchange excitation reproduces existing pp to pp eta data and predicts cross sections for HADES, PANDA, and SIS100.
Di-electrons from $\eta$ meson Dalitz decay in proton-proton collisions
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abstract
The reaction $ pp \to pp \eta \to pp \gamma e^+ e^-$ is discussed within a covariant effective meson-nucleon theory. The model is adjusted to data of the subreaction $pp \to pp \eta$. Our focus is on di-electrons from Dalitz decays of $\eta$ mesons, $\eta\to \gamma \gamma^* \to\gamma e^+e^-$, and the role of the corresponding transition form factor $F_{\eta \gamma \gamma^*}$. Numerical results are presented for the intermediate energy kinematics of HADES experiments.
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Exclusive $\eta$ production in proton-proton collisions at energies available at the GSI Facility for Antiproton and Ion Research
A phenomenological model with N(1535) dominance and rho-exchange excitation reproduces existing pp to pp eta data and predicts cross sections for HADES, PANDA, and SIS100.