Di-electrons from $η$ meson Dalitz decay in proton-proton collisions

Details Di-electrons from $η$ meson Dalitz decay in proton-proton collisions Di-electrons from $η$ meson Dalitz decay in proton-proton collisions

2007-02-09

arxiv.org/abs/nucl-th/0702033v1

Eur.Phys.J.A33:157-167,2007

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1140/epja/i2007-10453-y

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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