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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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