/ Experiment-Nucl nucl-ex/0608031


Dielectron production in C-12+C-12 collisions at 2-AGeV with HADES


Agakichiev, G. ; Agodi, C. ; Alvarez-Pol, H. ; Balanda, A. ; Bertini, D. ; Bielcik, J. ; Bellia, G. ; Bohmer, M. ; Bokemeyer, H. ; Boyard, J.L. ; Braun-Munzinger, P. ; Cabanelas, P. ; Chernenko, S. ; Christ, T. ; Coniglione, R. ; Cosentino, L. ; Diaz, J. ; Dohrmann, F. ; Duran, I. ; Eberl, T. ; Enghardt, W. ; Fabbietti, L. ; Fateev, O. ; Fernandez, C. ; Finocchiaro, P. ; Friese, J. ; Frohlich, I. ; Fuentes, B. ; Garabatos, C. ; Garzon, J.A. ; Gernhauser, R. ; Golubeva, M. ; Gonzalez-Diaz, D. ; Grosse, E. ; Guber, F. ; Hennino, T. ; Hlavac, S. ; Holzmann, R. ; Homolka, J. ; Ierusalimov, A. ; Iori, I. ; Ivashkin, A. ; Jaskula, M. ; Jurkovic, M. ; Kagarlis, M. ; Kajetanowicz, M. ; Kampfer, Burkhard ; Kanaki, K. ; Karavicheva, T. ; Kastenmuller, A. ; Kidon, L. ; Kienle, P. ; Koenig, I. ; Koenig, W. ; Korner, H.J. ; Kolb, B.W. ; Kotte, R. ; Krucken, R. ; Kugler, A. ; Kuhn, W. ; Kulessa, R. ; Kurepin, A. ; Lang, S. ; Lange, S. ; Lehnert, J. ; Lins, E. ; Magestro, D. ; Maiolino, C. ; Malarz, A. ; Markert, J. ; Metag, V. ; Mousa, J. ; Munch, M. ; Muntz, C. ; Naumann, L. ; Nekhaev, A. ; Novotny, J. ; Otwinowski, J. ; Pachmayer, Y.C. ; Pechenov, V. ; Perez, T. ; Piattelli, P. ; Pietraszko, J. ; Pleskac, R. ; Ploskon, M. ; Pospisil, V. ; Prokopowicz, W. ; Przygoda, W. ; Ramstein, B. ; Reshetin, A. ; Ritman, J. ; Roy-Stephan, M. ; Rustamov, A. ; Sadovsky, A ; Sailer, B. ; Salabura, P. ; Sanchez, M. ; Sapienza, P. ; Schmah, A. ; Schon, H. ; Schon, W. ; Schroder, C. ; Schwab, E. ; Simon, R.S. ; Smolyankin, V. ; Smykov, L. ; Spataro, S. ; Spruck, B. ; Strobele, H. ; Stroth, J. ; Sturm, Christian Thomas ; Sudol, M. ; Suk, M. ; Taranenko, A. ; Tlusty, P. ; Toia, A. ; Traxler, M. ; Tsertos, H. ; Vassiliev, D. ; Vazquez, A. ; Wagner, V. ; Walus, W. ; Wisniowski, M. ; Wojcik, T. ; Wustenfeld, J. ; Zanevsky, Y. ; Zeitelhack, K. ; Zovinec, D. ; Zumbruch, P.

Published in: Phys.Rev.Lett.
Year: 2007
Vol.: 98
Page No: 052302
Pages: 13

Abstract: The invariant-mass spectrum of $e^+ e^-$ pairs produced in $^{12}$C+$^{12}$C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over five 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.

Web-Page: http://link.aps.org/abstract/PRL/V98/E052302

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