Dilepton production in proton-proton collisions at BEVALAC energies

Abstract

The dilepton production in elementary $pp\to e^{+}{e}^{-}X$ reactions at BEVALAC energies $T_{lab}=1÷5$ GeV is investigated. The calculations include direct $e^{+}{e}^{-}$ decays of the vector mesons ${\rho }^0$, $\omega$, and $\varphi$, Dalitz decays of the ${\pi }^0$-, $\eta$-, -, $\omega$-, and $\varphi$-mesons, and of the baryon resonances $...$ . The subthreshold vector meson production cross sections in $pp$ collisions are treated in a way sufficient to avoid double counting with the inclusive vector meson production. The vector meson dominance model for the transition form factors of the resonance Dalitz decays $R\to e^{+}{e}^{-}N$ is used in an extended form to ensure correct asymptotics which are in agreement with the quark counting rules. Such a modification gives an unified and consistent description of both $R\to N\gamma$ radiative decays and $R\to N\rho (\omega )$ meson decays. The effect of multiple pion production on the experimental efficiency for the detection of the dilepton pairs is studied. We find the dilepton yield in reasonable agreement with the experimental data for the set of intermediate energies whereas at the highest energy $T_{lab}=4.88$ GeV the number of dilepton pairs is likely to be overestimated experimentally in the mass range $M=300÷700$ MeV.

25 pages (IOP style), 5 figures, revised manuscript accepted for publication in JPG

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• Electromagnetic transition form factors and dilepton decay rates of nucleon resonances
• Remarks on Delta Radiative and Dalitz Decays
• Perspectives of $e^{+}{e}^{-}$ production in pp, pd and p Be reactions at SIS energies

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