Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-02-26
Physics
Nuclear Physics
Nuclear Theory
6 pages, 6 figures, Paper presented at Hirschegg 2004, 'Probing nuclei and nucleons with electrons and photons', January 12th-
Scientific paper
We present consistent theoretical descriptions of the $\pi N \to e^+e^- N$ and $\gamma N \to e^+e^- N$ reactions on proton and neutron targets for total center of mass energies $\sqrt s$ ranging between 1.50 GeV and 1.75 GeV. These reactions are complementary to study the coupling of low-lying baryon resonances to vector meson-nucleon channels. We show in particular how the resonant structure of the amplitudes for both processes generates specific and large quantum interferences between $\rho$- and $\omega$-meson decays into $e^+e^-$ pairs. Data on the $\pi N \to e^+e^- N$ and $\gamma N \to e^+e^- N$ reactions are expected in the near future from the HADES program at GSI and from dilepton studies with CLAS at JLab.
Lutz Matthias F. M.
Soyeur Madeleine
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