Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy

G. Agakishiev, H. Alvarez-Pol, A. Balanda, R. Bassini, M. Böhmer, H. Bokemeyer, J. L. Boyard, P. Cabanelas, S. Chernenko, T. Christ, M. Destefanis, F. Dohrmann, A. Dybczak, T. Eberl, L. Fabbietti, O. Fateev, P. Finocchiaro, J. Friese, I. Fröhlich, T. GalatyukJ. A. Garzón, R. Gernhäuser, C. Gilardi, M. Golubeva, D. González-Díaz, F. Guber, M. Gumberidze, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, K. Kanaki, T. Karavicheva, I. Koenig, W. Koenig, B. W. Kolb, R. Kotte, A. Kozuch, F. Krizek, W. Kühn, A. Kugler, A. Kurepin, S. Lang, K. Lapidus, T. Liu, L. Maier, J. Markert, V. Metag, B. Michalska, E. Morinière, J. Mousa, C. Münch, C. Müntz, L. Naumann, J. Otwinowski, Y. C. Pachmayer, V. Pechenov, O. Pechenova, T. Perez Cavalcanti, J. Pietraszko, V. Pospísil, W. Przygoda, B. Ramstein, A. Reshetin, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, M. Sánchez, A. Schmah, E. Schwab, Yu G. Sobolev, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlusty, A. Toia, M. Traxler, R. Trebacz, H. Tsertos, V. Wagner, M. Wisniowski, T. Wojcik, J. Wüstenfeld, S. Yurevich, Y. Zanevsky, P. Zumbruch

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Abstract

Data on inclusive dielectron production are presented for the reaction p+p at 2.2 GeV measured with the high acceptance dielectron spectrometer (HADES). Our results supplemented data obtained earlier in this bombarding energy regime with the dilepton spectrometer (DLS) and HADES. The comparison with the 2.09 GeV DLS data is discussed. The reconstructed e+e- pair distributions are confronted with simulations, revealing an excess yield at invariant masses around 0.5 GeV/c2. Inclusive cross sections of neutral pion and η production are obtained.

Original languageEnglish
Article number054005
JournalPhysical Review C - Nuclear Physics
Volume85
Issue number5
DOIs
StatePublished - 25 May 2012
Externally publishedYes

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