Dilepton production in pp and CC collisions with HADES

I. Fröhlich,G. Agakishiev,C. Agodi,A. Balanda, G. Bellia,D. Belver,A. Belyaev,A. Blanco, M. Böhmer,J. L. Boyard, P. Braun-Munzinger,P. Cabanelas,E. Castro, S. Chernenko,T. Christ,M. Destefanis,J. Dıaz, F. Dohrmann,T. Eberl,L. Fabbietti, O. Fateev,P. Finocchiaro,P. J. R. Fonte, J. Friese,T. Galatyuk,J. A. Garzón,R. Gernhäuser, C. Gilardi, M. Golubeva, D. González-Dıaz,E. Grosse,F. Guber, Ch. Hadjivasiliou, M. Heilmann, 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,F. Krizek, R. Krücken,A. Kugler,W. Kühn, A. Kurepin, J. Lamas-Valverde,S. Lang,S. Lange,L. Lopes,A. Mangiarotti,J. Marın, J. Markert, V. Metag, B. Michalska,D. Mishra, E. Moriniere,J. Mousa, C. Müntz,L. Naumann, R. Novotny,J. Otwinowski,Y. C. Pachmayer,M. Palka, V. Pechenov,O. Pechenova,T. Pérez Cavalcanti,J. Pietraszko,W. Przygoda, B. Ramstein, A. Reshetin, M. Roy-Stephan,A. Rustamov, A. Sadovsky, B. Sailer,P. Salabura,A. Schmah,R. Simon,S. Spataro,B. Spruck, H. Ströbele,J. Stroth,C. Sturm,M. Sudol, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz,H. Tsertos, I. Veretenkin,V. Wagner,H. Wen, M. Wisniowski,T. Wojcik, J. Wüstenfeld, Y. Zanevsky,P. Zumbruch

European Physical Journal A（2007）

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摘要

. e + 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 12 C + 12 C reaction at 2AGeV is presented and compared with a simplified thermal model.

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关键词

14.40.Aq π , K , and η mesons

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