/ Experiment-Nucl arXiv:0711.4281

Study of dielectron production in C+C collisions at 1-A-GeV

Agakishiev, G. (Giessen U.) ; Agodi, C. (INFN, LNS) ; Alvarez-Pol, H. (Santiago de Compostela U.) ; Balanda, A. (Jagiellonian U.) ; Bassini, R. (INFN, Milan) ; Bellia, G. (INFN, LNS) ; Belver, D. (Santiago de Compostela U.) ; Belyaev, A. (Dubna, JINR) ; Blanco, A. (LIP, Coimbra) ; Bohmer, M. (Munich, Tech. U.) ; Bortolotti, A. (INFN, Milan) ; Boyard, J.L. (Orsay, IPN) ; Braun-Munzinger, P. (Darmstadt, GSI) ; Cabanelas, P. (Santiago de Compostela U.) ; Castro, E. (Santiago de Compostela U.) ; Chernenko, S. (Dubna, JINR) ; Christ, T. (Munich, Tech. U.) ; Destefanis, M. (Giessen U.) ; Diaz, J. (Valencia U., IFIC) ; Dohrmann, F. (Forschungszentrum Dresden Rossendorf) ; Dybczak, A. (Jagiellonian U.) ; Eberl, T. (Munich, Tech. U.) ; Fabbietti, L. (Munich, Tech. U.) ; Fateev, O. (Dubna, JINR) ; Finocchiaro, P. (INFN, LNS) ; Fonte, P. (LIP, Coimbra) ; Friese, J. (Munich, Tech. U.) ; Frohlich, I. (Frankfurt U., Inst. Kernphys.) ; Galatyuk, T. (Darmstadt, GSI) ; Garzon, J.A. (Santiago de Compostela U.) ; Gernhauser, R. (Munich, Tech. U.) ; Gil, A. (Valencia U., IFIC) ; Gilardi, C. (Giessen U.) ; Golubeva, M. (Moscow, INR) ; Gonzalez-Diaz, D. (Darmstadt, GSI) ; Grosse, E. (Forschungszentrum Dresden Rossendorf) ; Guber, F. (Moscow, INR) ; Heilmann, M. (Frankfurt U., Inst. Kernphys.) ; Heinz, T. (Darmstadt, GSI) ; Hennino, T. (Orsay, IPN) ; Holzmann, R. (Darmstadt, GSI) ; Ierusalimov, A. (Dubna, JINR) ; Iori, I. (INFN, Milan) ; Ivashkin, A. (Moscow, INR) ; Jurkovic, M. (Munich, Tech. U.) ; Kampfer, B. (Forschungszentrum Dresden Rossendorf) ; Kajetanowicz, M. (Jagiellonian U.) ; Kanaki, K. (Forschungszentrum Dresden Rossendorf) ; Karavicheva, T. (Moscow, INR) ; Kirschner, D. (Giessen U.) ; Koenig, I. (Darmstadt, GSI) ; Koenig, W. (Darmstadt, GSI) ; Kolb, B.W. (Darmstadt, GSI) ; Kotte, R. (Forschungszentrum Dresden Rossendorf) ; Kozuch, A. (Jagiellonian U.) ; Krasa, A. (Rez, Nucl. Phys. Inst.) ; Krizek, F. (Rez, Nucl. Phys. Inst.) ; Krucken, R. (Munich, Tech. U.) ; Kuhn, W. (Giessen U.) ; Kugler, A. (Rez, Nucl. Phys. Inst.) ; Kurepin, A. (Moscow, INR) ; Lamas-Valverde, J. (Santiago de Compostela U.) ; Lang, S. (Darmstadt, GSI) ; Lange, J.S. (Giessen U.) ; Lapidus, K. (Moscow, INR) ; Lopes, L. (LIP, Coimbra) ; Maier, L. (Munich, Tech. U.) ; Mangiarotti, A. (LIP, Coimbra) ; Marin, J. (Santiago de Compostela U.) ; Markert, J. (Frankfurt U., Inst. Kernphys.) ; Metag, V. (Giessen U.) ; Michalska, B. (Jagiellonian U.) ; Mishra, D. (Giessen U.) ; Moriniere, E. (Orsay, IPN) ; Mousa, J. (Darmstadt, GSI) ; Munch, M. (Darmstadt, GSI) ; Muntz, C. (Frankfurt U., Inst. Kernphys.) ; Naumann, L. (Forschungszentrum Dresden Rossendorf) ; Novotny, R. (Giessen U.) ; Otwinowski, J. (Jagiellonian U.) ; Pachmayer, Y.C. (Frankfurt U., Inst. Kernphys.) ; Palka, M. (Darmstadt, GSI) ; Parpottas, Y. (Giessen U.) ; Pechenov, V. (Giessen U.) ; Pechenova, O. (Giessen U.) ; Perez Cavalcanti, T. (Giessen U.) ; Pietraszko, J. (Darmstadt, GSI) ; Pleskac, R. (Rez, Nucl. Phys. Inst.) ; Pospisil, V. (Rez, Nucl. Phys. Inst.) ; Przygoda, W. (Jagiellonian U.) ; Ramstein, B. (Orsay, IPN) ; Reshetin, A. (Moscow, INR) ; Roy-Stephan, M. (Orsay, IPN) ; Rustamov, A. (Darmstadt, GSI) ; Sadovsky, A. (Moscow, INR) ; Sailer, B. (Munich, Tech. U.) ; Salabura, P. (Jagiellonian U.) ; Schmah, A. (Darmstadt, GSI) ; Schroeder, C. (Darmstadt, GSI) ; Schwab, E. (Darmstadt, GSI) ; Simon, R.S. (Darmstadt, GSI) ; Sobolev, Yu.G. (Rez, Nucl. Phys. Inst.) ; Spataro, S. (Giessen U.) ; Spruck, B. (Giessen U.) ; Strobele, H. (Frankfurt U., Inst. Kernphys.) ; Stroth, J. (Frankfurt U., Inst. Kernphys.) ; Sturm, Christian Thomas (Frankfurt U., Inst. Kernphys.) ; Sudol, M. (Darmstadt, GSI) ; Tarantola, A. (Frankfurt U., Inst. Kernphys.) ; Teilab, K. (Frankfurt U., Inst. Kernphys.) ; Tlusty, P. (Rez, Nucl. Phys. Inst.) ; Toia, A. (Giessen U.) ; Traxler, M. (Darmstadt, GSI) ; Trebacz, R. (Jagiellonian U.) ; Tsertos, H. (Moscow, INR) ; Veretenkin, I. (Moscow, INR) ; Wagner, V. (Rez, Nucl. Phys. Inst.) ; Weber, M. (Munich, Tech. U.) ; Wen, H. (Giessen U.) ; Wisniowski, M. (Jagiellonian U.) ; Wojcik, T. (Jagiellonian U.) ; Wustenfeld, J. (Forschungszentrum Dresden Rossendorf) ; Yurevich, S. (Darmstadt, GSI) ; Zanevsky, Y. (Dubna, JINR) ; Zhou, P. (Forschungszentrum Dresden Rossendorf) ; Zumbruch, P. (Darmstadt, GSI)

Published in: Phys.Lett.
Year: 2008
Vol.: B663
Page No: 43-48

Abstract: The emission of e+e- pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the pi0-Dalitz to the rho/omega! invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment.

Keyword(s): Dilepton spectroscopy ; Heavy-ion reactions ; Excess yield ; Excitation function ; DLS puzzle

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