Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

TitleBaryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
Publication TypeJournal Article
Year of Publication2014
AuthorsAgakishiev, G., A. Balanda, D. Belver, A. Belyaev, J. C. Berger-Chen, A. Blanco, M. Bohmer, J. L. Boyard, P. Cabanelas, S. Chernenko, A. Dybczak, E. Epple, L. Fabbietti, O. Fateev, P. Finocchiaro, P. Fonte, J. Friese, I. Frohlich, T. Galatyuk, J. A. Garzon, R. Gernhauser, K. Gobel, M. Golubeva, D. Gonzalez-Diaz, F. Guber, M. Gumberidze, T. Heinz, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovic, B. Kampfer, T. Karavicheva, I. Koenig, W. Koenig, B. W. Kolb, G. Kornakov, R. Kotte, A. Krasa, F. Krizek, R. Krucken, H. Kuc, W. Kuhn, A. Kugler, A. Kurepin, V. Ladygin, R. Lalik, S. Lang, K. Lapidus, A. Lebedev, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, C. Muntz, L. Naumann, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, A. Rustamov, A. Sadovsky, P. Salabura, A. Schmah, E. Schwab, J. Siebenson, Y. G. Sobolev, S. Spataro, B. Spruck, H. Strobele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, T. Vasiliev, V. Wagner, M. Weber, C. Wendisch, J. Wustenfeld, S. Yurevich, and Y. Zanevsky
JournalEuropean Physical Journal A
Date PublishedMay
ISBN Number1434-6001
Accession NumberWOS:000335735700002
AbstractWe report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of 3.5 GeV based on data measured with HADES. The exclusive channels pp -> np pi(+) and pp -> pp pi(0) as well as pp -> ppe(+)e(-) are studied simultaneously for the first time. The invariant masses and angular distributions of the pion-nucleon systems were studied and compared to simulations based on a resonance model ansatz assuming saturation of the pion production by an incoherent sum of baryonic resonances (R) with masses < 2 GeV/c(2). A very good description of the one-pion production is achieved allowing for an estimate of individual baryon resonance production cross sections which are used as input to calculate the dielectron yields from R -> pe(+)e(-) decays. Two models of the resonance decays into dielectrons are examined assuming a point-like RN gamma* coupling and the dominance of the rho meson. The results of model calculations are compared to data from the exclusive ppe(+)e(-) channel by means of the dielectron and pe(+)e(-) invariant mass distributions.
URL<Go to ISI>://WOS:000335735700002
Short TitleBaryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
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