Dielectron production in 12C+12C collisions at 2A GeV 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 Eberl, W 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,

Physical Review Letters 2007 Februrary 3

The invariant-mass spectrum of e+e- pairs produced in 12C+12C 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 pi(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and eta account for all the yield up to 0.15 GeV/c(2), 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.

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