dorsal/arxiv
View SchemaDi-Electron Bremsstrahlung in Intermediate-Energy pn and Dp Collisions
| Authors | L. P. Kaptari, B. Kampfer |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0504072 |
| URL | https://arxiv.org/abs/nucl-th/0504072 |
| DOI | 10.1016/j.nuclphysa.2005.10.007 |
| Journal | Nucl.Phys.A764:338-370,2006 |
Abstract
Invariant mass spectra of di-electrons stemming from bremsstrahlung processes are calculated in a covariant diagrammatical approach for the exclusive reaction D p \to p_{\rm sp} n p e^+ e^- with detection of a forward spectator proton, p_{sp}. We employ an effective nucleon-meson theory for parameterizing the sub-reaction n p \to n p e^+ e^- and, within the Bethe-Salpeter formalism, derive a factorization of the cross section in the form {d\sigma_{D p \to p_{\rm sp} n p e^+ e^-}}/{dM}= {d\sigma_{n p \to n p e^+ e^-}}/{dM} \times kinematical factor related solely to the deuteron (M is the e^+ e^- invariant mass). The effective nucleon-meson interactions, including the exchange mesons \pi, \sigma, \omega and \rho as well as excitation and radiative decay of \Delta(1232), have been adjusted to the process pp \to pp e^+ e^- at energies below the vector meson production threshold. At higher energies, contributions from \omega and \rho meson excitations are analyzed in both, NN and Dp collisions. A relation to two-step models is discussed. Subthreshold di-electron production in Dp collisions at low spectator momenta is investigated as well. Calculations have been performed for kinematical conditions envisaged for forthcoming experiments at HADES.
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"abstract": "Invariant mass spectra of di-electrons stemming from bremsstrahlung processes\nare calculated in a covariant diagrammatical approach for the exclusive\nreaction D p \\to p_{\\rm sp} n p e^+ e^- with detection of a forward spectator\nproton, p_{sp}. We employ an effective nucleon-meson theory for parameterizing\nthe sub-reaction n p \\to n p e^+ e^- and, within the Bethe-Salpeter formalism,\nderive a factorization of the cross section in the form {d\\sigma_{D p \\to\np_{\\rm sp} n p e^+ e^-}}/{dM}= {d\\sigma_{n p \\to n p e^+ e^-}}/{dM} \\times\nkinematical factor related solely to the deuteron (M is the e^+ e^- invariant\nmass). The effective nucleon-meson interactions, including the exchange mesons\n\\pi, \\sigma, \\omega and \\rho as well as excitation and radiative decay of\n\\Delta(1232), have been adjusted to the process pp \\to pp e^+ e^- at energies\nbelow the vector meson production threshold. At higher energies, contributions\nfrom \\omega and \\rho meson excitations are analyzed in both, NN and Dp\ncollisions. A relation to two-step models is discussed. Subthreshold\ndi-electron production in Dp collisions at low spectator momenta is\ninvestigated as well. Calculations have been performed for kinematical\nconditions envisaged for forthcoming experiments at HADES.",
"arxiv_id": "nucl-th/0504072",
"authors": [
"L. P. Kaptari",
"B. Kampfer"
],
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"doi": "10.1016/j.nuclphysa.2005.10.007",
"journal_ref": "Nucl.Phys.A764:338-370,2006",
"title": "Di-Electron Bremsstrahlung in Intermediate-Energy pn and Dp Collisions",
"url": "https://arxiv.org/abs/nucl-th/0504072"
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