Dielectron production in C12+C12 collisions at 2AGeV with the HADES spectrometer

G. Agakichiev, C. Agodi, H. Alvarez-Pol, A. Bałanda, D. Bertini, J. Bielcik, G. Bellia, M. Böhmer, H. Bokemeyer, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, S. Chernenko, T. Christ, R. Coniglione, L. Cosentino, J. Díaz, F. Dohrmann, I. Durán, T. EberlW. Enghardt, L. Fabbietti, O. Fateev, C. Fernandez, P. Finocchiaro, J. Friese, I. Fröhlich, B. Fuentes, C. Garabatos, J. A. Garzón, R. Gernhäuser, C. Gilardi, M. Golubeva, D. González-Díaz, E. Grosse, F. Guber, T. Hennino, S. Hlavac, R. Holzmann, J. Homolka, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jaskuła, M. Jurkovic, M. Kagarlis, M. Kajetanowicz, B. Kämpfer, K. Kanaki, T. Karavicheva, A. Kastenmüller, L. Kidoń, P. Kienle, I. Koenig, W. Koenig, H. J. Körner, B. W. Kolb, R. Kotte, R. Krücken, A. Kugler, W. Kühn, R. Kulessa, A. Kurepin, S. Lang, S. Lange, J. Lehnert, E. Lins, D. Magestro, C. Maiolino, A. Malarz, J. Markert, V. Metag, J. Mousa, M. Münch, C. Müntz, L. Naumann, A. Nekhaev, J. Novotny, J. Otwinowski, Y. C. Pachmayer, V. Pechenov, T. Pérez, P. Piattelli, J. Pietraszko, R. Pleskac, M. Płoskoń, V. Pospísil, W. Prokopowicz, W. Przygoda, B. Ramstein, A. Reshetin, J. Ritman, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, M. Sánchez, P. Sapienza, A. Schmah, H. Schön, W. Schön, C. Schröder, E. Schwab, R. S. Simon, V. Smolyankin, L. Smykov, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, M. Sudoł, M. Suk, A. Taranenko, P. Tlusty, A. Toia, M. Traxler, H. Tsertos, D. Vassiliev, A. Vázquez, V. Wagner, W. Waluś, M. Wiśniowski, T. Wójcik, J. Wüstenfeld, Y. Zanevsky, K. Zeitelhack, D. Zovinec, P. Zumbruch

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Abstract

The invariant-mass spectrum of e+e- pairs produced in C12+C12 collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 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 0.15GeV/c2, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Original languageEnglish
Article number052302
JournalPhysical Review Letters
Volume98
Issue number5
DOIs
StatePublished - 1 Feb 2007

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