| Thème(s) : |
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Physique/Physique Nucléaire Expérimentale
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| Titre : |
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Inclusive dielectron spectra in p plus p collisions at 3.5 GeV kinetic beam energy |
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| Auteur : |
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G. Agakishiev, J. L. Boyard1, M. Gumberidze1, T. Hennino1, E. Morinière1, B. Ramstein1 |
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| Laboratoire : |
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| Résumé : |
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We present the inclusive invariant mass, transverse momentum and rapidity distributions of dielectrons (e+e- pairs) in p+p interactions at 3.5GeV beam kinetic energy. In the vector meson mass region, a distinct peak corresponding to direct ω decays is reconstructed with a 2% mass resolution. The data is compared to predictions from three model calculations. Due to the large acceptance of the HADES apparatus for e+e- invariant masses above 0.2 GeV/c 2 and for transverse pair momenta p t < 1 GeV/c, acceptance corrections are, to a large extent, model independent. This allows us to extract from dielectron data for the first time at this energy the inclusive production cross-sections for light vector mesons. Inclusive production cross-sections for π0 and η mesons are also reported. The obtained results will serve as an important reference for the study of vector meson production in proton-nucleus and heavy-ion collisions. Furthermore, using this data, an improved value for the upper bound of the branching ratio for direct η decays into the electron-positron channel is obtained. |
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| Collaboration/Projet : |
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HADES |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2012 |
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| Nom du périodique : |
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| European Physical Journal A: Hadrons and Nuclei (Eur. Phys. J. A) |
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EDP Sciences: EPJ |
| ISSN |
1434-6001 (eISSN : 1434-601X) |
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| Volume : |
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48 |
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| Page/Article : |
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64 |
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| Commentaire : |
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See paper for full list of authors |
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