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Dielectron production in C-12(+) C-12 collisions at 2 A GeV with HADES

AuthorsMarkert, J.; Agakishiev, G.; Agodi, C.; Balanda, A.; Bellia, G.; Belver, D.; Belyaev, A.; Blanco, Alfonso; Böhmer, M.; Boyard, J. L.; Braun-Munzinger, P.; 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.; Tarantola, A.; Teilab, K.; Tlusty, P.; Traxler, M.; Trebacz, R.; Tsertos, H.; Veretenkin, I.; Wagner, V.; Wen, H.; Wisniowski, M.; Wojcik, T.; Wustenfeld, J.; Yurevich, S.; Zanevsky, Y.; Zumbruch, P.; Cabanelas, P.; Castro, E.; Chernenko, S.; Christ, T.; Destefanis, M.; Díaz Medina, José ; Dohrmann, F.; Dybczak, A.; Eberl, T.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Fonte, P.; Friese, J.; Frohlich, I.; Galatyuk, T.; Garzón, Juan Antonio; Gernhäuser, R.; Gilardi, C.; Golubeva, M.; González Díaz, Diego; Grosse, E.; Guber, F.; Heilmann, M.; Hennino, T.; Holzmann, R.; HADES Collaboration; 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.; Kuhn, W.; Kugler, A.; Kurepin, A.; Lamas-Valverde, J.; Lang, S.; Lange, J. S.; Lopes, L.; Maier, L.; Mangiarotti, A.; Marín, J.; Markert, J.; Metag, V.; Michalska, B.; Mishra, D.; Moriniere, E.; Mousa, J.; Muntz, C.; Naumann, L.; Novotny, R.; Otwinowski, J.; Pachmayer, Y. C.; Palka, M.; Pechenov, V.; Pechenova, O.
KeywordsHeavy-ion Collisions
Issue Date20-Jul-2007
PublisherInstitute of Physics Publishing
CitationJournal of Physics G - Nuclear and Particle Physics 34(8): S1041-S1045 (2007)
AbstractWe report on a measurement of electron pair production in C-12(+) C-12 collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. The measured pair production probabilities span over five orders of magnitude from the π(0)-Dalitz to the ρ/w invariant-mass region. Dalitz decays of π(0) and η account for all the yield up to 0.15 GeV/c^2, but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of C-12(+) C-12 collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario.
Description5 pages, 2 figures.-- ISI Article Identifier: 000248251400153
Printed version published on Aug 2007.
Publisher version (URL)http://dx.doi.org/10.1088/0954-3899/34/8/S152
Appears in Collections:(IFIC) Artículos
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