Dielectron production in $^{12}$C+$^{12}$C collisions at 2 A GeV with HADES
- Markert, J.
- Agakishiev, G.
- Agodi, C.
- Balanda, A.
- Bellia, G.
- Belver, D.
- Belyaev, A.
- Blanco, A.
- Böhmer, M.
- L. Boyard, J.-
- Braun-Munzinger, P.
- Cabanelas, P.
- Castro, E.
- Chernenko, S.
- Christ, T.
- Destefanis, M.
- Diaz, J.
- Dohrmann, F.
- Dybczak, A.
- Eberl, T.
- Fabbietti, L.
- Fateev, O.
- Finocchiaro, P.
- Fonte, P.
- Friese, J.
- Fröhlich, I.
- Galatyuk, T.
- A. Garzón, J.
- Gernhäuser, R.
- Gilardi, C.
- Golubeva, M.
- González-Díaz, D.
- Grosse, E.
- Guber, F.
- Heilmann, M.
- Hennino, T.
- Holzmann, R.
- Ierusalimov, A.
- Iori, I.
- Ivashkin, A.
- Jurkovic, M.
- Kämpfer, B.
- Kanaki, K.
- Karavicheva, T.
- Kirschner, D.
- Koenig, I.
- Koenig, W.
- W. Kolb, B.
- Kotte, R.
- Kozuch, A.
- Krizek, F.
- Krücken, R.
- Kühn, W.
- Kugler, A.
- Kurepin, A.
- Lamas-Valverde, J.
- Lang, S.
- S. Lange, J.
- Lopes, L.
- Maier, L.
- Mangiarotti, A.
- Marín, J.
- Metag, V.
- Michalska, B.
- Mishra, D.
- Morinière, E.
- Mousa, J.
- Müntz, C.
- Naumann, L.
- Novotny, R.
- Otwinowski, J.
- C. Pachmayer, Y.
- Palka, M.
- Pechenova, O.
- Pérez Cavalcanti, T.
- 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.
- Ströbele, 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.
- Wüstenfeld, J.
- Yurevich, S.
- Zanevskyan, Y.
- Zumbruch, P.
DOIAbstract
International audienceWe report on a measurement of electron pair production in 12C+12C 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 π0-Dalitz to the ρ/ω invariant-mass region. Dalitz decays of π0 and η account for all the yield up to 0.15 GeV/c2, 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 12C+12C collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario
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