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, $etato gamma gamma^* togamma e^+e^-$, 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.
تحميل البحث