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Dilepton production in pp and CC collisions with HADES

AuthorsFrohlich, I.; Agakishiev, G.; Agodi, C.; Balanda, A.; Bellia, G.; Belver, D.; Belyaev, A.; Blanco, Alfonso; Böhmer, M.; Boyard, J. L.; Braun-Munzinger, P.; Muntz, C.; Naumann, L.; Novotny, R.; Otwinowski, J.; Pachmayer, Y. C.; Palka, M.; Pechenov, V.; Pechenova, O.; Cavalcanti, T. P.; Pietraszko, J.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Roy-Stephan, M.; Rustamov, A.; Sadovsky, A.; Sailer, B.; Salabura, P.; Schmah, A.; Simon, R.; Spataro, S.; Spruck, B.; Strobele, H.; Stroth, J.; Sturm, C.; Sudol, M.; Teilab, K.; Tlusty, P.; Traxler, M.; Trebacz, R.; Tsertos, H.; Veretenkin, I.; Wagner, V.; Wen, H.; Wisniowski, M.; Wojcik, T.; Wustenfeld, J.; Zanevsky, Y.; Zumbruch, P.; Cabanelas, P.; Castro, E.; Chernenko, S.; Christ, T.; Destefanis, M.; Díaz Medina, José ; Dohrmann, F.; Eberl, T.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Fonte, P.; Friese, J.; Galatyuk, T.; Garzón, Juan Antonio; Gernhäuser, R.; Gilardi, C.; Golubeva, M.; González Díaz, Diego; Grosse, E.; Guber, F.; Hadjivasiliou, C.; Heilmann, M.; Hennino, T.; Holzmann, R.; Ierusalimov, A.; Iori, I.; Ivashkin, A.; Jurkovic, M.; Kampfer, B.; Kanaki, K.; Karavicheva, T.; Kirschner, D.; Koenig, I.; Koenig, W.; Kolb, B. W.; Kotte, R.; Kozuch, A.; Krizek, F.; Krucken, R.; Kugler, A.; Kuhn, W.; Kurepin, A.; Lamas-Valverde, J.; HADES Collaboration; Lang, S.; Lange, J. S.; Lopes, L.; Mangiarotti, A.; Marín, J.; Markert, J.; Metag, V.; Michalska, B.; Mishra, D.; Moriniere, E.; Mousa, J.
KeywordsHeavy-ion collisions
[PACS] Decays of other mesons
[PACS] Electromagnetic decays
[PACS] π, K, and η mesons
[PACS] Other reactions above meson production thresholds (energies > 400MeV)
Issue Date15-Mar-2007
PublisherSocietà Italiana di Fisica
CitationEuropean Physical Journal A 31(4): 831-835 (2007)
Abstracte(+) e(-) production was studied using the High Acceptance DiElectron Spectrometer (HADES). In pp collisions at 2.2GeV kinetic beam energy, the exclusive η production and the Dalitz decay η -> γe(+)e(-) have been reconstructed. The electromagnetic form factor of the latter decay was found to be in good agreement with the existing theoretical predictions. In addition, an inclusive e(+)e(-) invariant-mass spectrum from the C-12 + C-12 reaction at 2AGeV is presented and compared with a simplified thermal model.
Description5 pages, 4 figures.-- PACS nrs.: 13.25.Jx, 13.40.Hq, 14.40.Aq, 25.40.Ve.-- ISI Article Identifier: 000245667300102.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-ex/0610048
Contributed to: The IVth International Conference on Quarks and Nuclear Physics - QNP 2006 (Madrid, Spain, June 5-10, 2006).
Publisher version (URL)http://dx.doi.org/10.1140/epja/i2006-10253-y
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