Hrsg.: HADES Collaboration (2017)
Analysis of the exclusive final state npe⁺e⁻ in quasi-free np reaction.
In: The European Physical Journal A, 53 (7)
doi: 10.1140/epja/i2017-12341-3
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam of kinetic energy 1.25 GeV/u impinging on a liquid hydrogen target. Our measurements with HADES confirm a significant excess of e+e− pairs above the π0 mass in the exclusive channel dp → npe+e−(pspect) as compared to the exclusive channel ppe+e− measured in proton-proton collisions at the same energy. That excess points to different bremsstrahlung production mechanisms. Two models were evaluated for the role of the charged pion exchange between nucleons and double-Δ excitation combined with intermediate ρ-meson production. Differential cross sections as a function of the e+e−invariant mass and of the angles of the virtual photon, proton and electrons provide valuable constraints and encourage further investigations on both experimental and theoretical sides.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Art des Eintrags: | Bibliographie |
| Titel: | Analysis of the exclusive final state npe⁺e⁻ in quasi-free np reaction |
| Sprache: | Englisch |
| Publikationsjahr: | 18 Juli 2017 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The European Physical Journal A |
| Jahrgang/Volume einer Zeitschrift: | 53 |
| (Heft-)Nummer: | 7 |
| DOI: | 10.1140/epja/i2017-12341-3 |
| Kurzbeschreibung (Abstract): | We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam of kinetic energy 1.25 GeV/u impinging on a liquid hydrogen target. Our measurements with HADES confirm a significant excess of e+e− pairs above the π0 mass in the exclusive channel dp → npe+e−(pspect) as compared to the exclusive channel ppe+e− measured in proton-proton collisions at the same energy. That excess points to different bremsstrahlung production mechanisms. Two models were evaluated for the role of the charged pion exchange between nucleons and double-Δ excitation combined with intermediate ρ-meson production. Differential cross sections as a function of the e+e−invariant mass and of the angles of the virtual photon, proton and electrons provide valuable constraints and encourage further investigations on both experimental and theoretical sides. |
| Zusätzliche Informationen: | Art.No.: 149 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Untersuchung von Quark-Materie mit virtuellen Photonen |
| Hinterlegungsdatum: | 26 Feb 2024 15:45 |
| Letzte Änderung: | 26 Feb 2024 15:45 |
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