Measurement of low-mass e + e − pair production in 1 and 2 A GeV C–C collision with HADES

M. Sudol,G. Agakishiev,C. Agodi,A. Balanda,G. Bellia,D. Belver,A. Belyaev, J. Bielcik,A. Blanco, A. Bortolotti,J. L. Boyard, P. Braun-Munzinger,P. Cabanelas, S. Chernenko,T. Christ,R. Coniglione,M. Destefanis,J. Díaz, F. Dohrmann, I. Durán, A. Dybczak,T. Eberl,L. Fabbietti, O. Fateev,R. Ferreira-Marques,P. Finocchiaro,P. Fonte, J. Friese, I. Fröhlich,T. Galatyuk,J. A. Garzón, R. Gernhäuser,A. Gil, C. Gilardi, M. Golubeva, D. González-Díaz,E. Grosse,F. Guber, M. Heilmann,T. Heinz, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori,A. Ivashkin,M. Jurkovic,B. Kämpfer,K. Kanaki, T. Karavicheva,D. Kirschner, I. Koenig,W. Koenig,B. W. Kolb,R. Kotte, A. Kozuch, A. Krása,F. Křížek, R. Krücken,W. Kühn,A. Kugler, A. Kurepin,J. Lamas-Valverde,S. Lang,J. S. Lange, K. Lapidus,L. Lopes,M. Lorenz, L. Maier,C. Maiolino,A. Mangiarotti,J. Marín, J. Markert, V. Metag, B. Michalska,J. Michel, E. Morinière,J. Mousa, M. Münch, C. Müntz,L. Naumann, R. Novotny,J. Otwinowski,Y. C. Pachmayer,M. Palka,Y. Parpottas, V. Pechenov,O. Pechenova,T. Pérez Cavalcanti,P. Piattelli,J. Pietraszko,V. Pospíšil,W. Przygoda, B. Ramstein, A. Reshetin, M. Roy-Stephan,A. Rustamov, A. Sadovsky, B. Sailer,P. Salabura,P. Sapienza,A. Schmah, C. Schroeder,E. Schwab, R. Simon,Yu. G. Sobolev,S. Spataro,B. Spruck, H. Ströbele,J. Stroth,C. Sturm,A. Tarantola, K. Teilab, P. Tlustý, M. Traxler, R. Trebacz,H. Tsertos,V. Wagner,M. Weber, M. Wisniowski,T. Wojcik, J. Wüstenfeld, S. Yurevich, Y. Zanevsky,P. Zhou,P. Zumbruch

European Physical Journal C（2009）

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摘要

HADES is a secondary generation experiment operated at GSI Darmstadt with the main goal to study dielectron production in proton, pion and heavy ion induced reactions. The first part of the HADES mission is to reinvestigate the puzzling pair excess measured by the DLS collaboration in C + C and Ca + Ca collisions at 1 A GeV. For this purpose dedicated measurements with the C + C system at 1 and 2 A GeV were performed. The pair excess above a cocktail of free hadronic decays has been extracted and compared to the one measured by DLS. Furthermore, the excess is confronted with predictions of various model calculations.

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25.75.-q,25.75.Dw,13.40.Hq

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