1203.2549 (G. Agakishiev et al.)

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

G. Agakishiev, H. Alvarez-Pol, A. Balanda, R. Bassini, M. Böhmer, H. Bokemeye, 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. Galatyuk, J. A. Garzón, R. Gernhäuser, C. Gilardi, M. Golubeva, D. González-Díaz, F. Guber, M. Gumberidze, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ierusalimov, 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, M. Münch, C. Müntz, L. Naumann, J. Otwinowski, Y. C. Pachmayer, V. Pechenov, O. Pechenova, T. Perez Cavalcanti, J. Pietraszko, V. Pospisil, 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

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 supplement data obtained earlier in this bombarding energy regime by DLS and HADES. The comparison with the 2.09 GeV DLS data is discussed. The reconstructed e+e- distributions are confronted with simulated pair cocktails, revealing an excess yield at invariant masses around 0.5 GeV/c2. Inclusive cross sections of neutral pion and eta production are obtained.

View original: http://arxiv.org/abs/1203.2549