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28 March 2024
 
  » arxiv » 1108.4265

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Dilepton production in pp and np collisions at 1.25 GeV
B. V. Martemyanov ; M. I. Krivoruchenko ; Amand Faessler ;
Date 22 Aug 2011
AbstractThe inclusive reactions $pp ightarrow e^+ e^- X$ and $np ightarrow e^+ e^- X$ at the laboratory kinetic energy of 1.25 GeV are investigated in a model of dominance of nucleon and $Delta$ resonances. Experimental data for these reactions have recently been reported by the HADES Collaboration. In the original model, the dileptons are produced either from the decays of nucleon and $Delta$ resonances $R ightarrow N e^+ e^-$ or from the Dalitz decays of $pi^0$- and $eta$-mesons created in the $R o Npi^0$ and $R o Neta$ decays. We found that the distribution of dilepton invariant masses in the $pp ightarrow e^+ e^- X$ reaction is well reproduced by the contributions of $R ightarrow N e^+ e^-$ decays and $R ightarrow N pi^0$, $pi^0 o gamma e^+e^-$ decays. Among the resonances, the predominant contribution comes from the $Delta(1232)$, which determines both the direct decay channel $R ightarrow N e^+ e^-$ and the pion decay channel. In the collisions $np ightarrow e^+ e^- X$, additional significant contributions arise from the $eta$-meson Dalitz decays, produced in the $np ightarrow npeta$ and $np ightarrow deta$ reactions, the radiative capture $np ightarrow d e^+ e^-$, and the $np ightarrow np e^+ e^-$ bremsstrahlung. These mechanisms may partly explain the strong excess of dileptons in the cross section for collisions of $np$ versus $pp$, which ranges from 7 to 100 times for the dilepton invariant masses of 0.2 to 0.5 GeV.
Source arXiv, 1108.4265
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