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

Authors :
Markert, J.
Agakishiev, G.
Agodi, C.
Balanda, A.
Bellia, G.
Belver, D.
Belyaev, A.
Blanco, A.
Boehmer, M.
Boyard, J. L.
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.
Froehlich, I.
Galatyuk, T.
Garzon, J. A.
Gernhaeuser, R.
Gilardi, C.
Golubeva, M.
Gonzalez-Diaz, D.
Grosse, E.
Guber, F.
Heilmann, M.
Hennino, T.
Holzmann, R.
Ierusalimov, A.
Iori, I.
Ivashkin, A.
Jurkovic, M.
Kaempfer, B.
Kanaki, K.
Karavicheva, T.
Kirschner, D.
Koenig, I.
Koenig, W.
Kolb, B. W.
Kotte, R.
Kozuch, A.
Krizek, F.
Kruecken, R.
Kuehn, W.
Kugler, A.
Kurepin, A.
Lamas-Valverde, J.
Lang, S.
Lange, J. S.
Lopes, L.
Maier, L.
Mangiarotti, A.
Marin, J.
Metag, V.
Michalska, B.
Mishra, D.
Moriniere, E.
Mousa, J.
Muentz, C.
Naumann, L.
Novotny, R.
Otwinowski, J.
Pachmayer, Y. C.
Palk! A, 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.
Stroebele, 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.
Wuestenfeld, J.
Yurevich, S.
Zanevsky, Y.
Zumbruch, P.
Source :
Journal of Physics G-Nuclear and Particle Physics 34(2007), S1041-S1045
Publication Year :
2007

Abstract

We 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 pi0-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi0 and 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.

Subjects

Subjects :
TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY
High Energy Physics::Experiment
Nuclear Experiment

Details

Language :
English
Database :
OpenAIRE
Journal :
Journal of Physics G-Nuclear and Particle Physics 34(2007), S1041-S1045
Accession number :
edsair.od......4577..67edf1f1e14c9a7e1ee83973a7f8c04d

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