Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
Creators: name: Agakishiev, G.
name: Balanda, A.
name: Belver, D.
name: Belyaev, A.
name: Berger-Chen, J. C.
name: Blanco, A.
name: Böhmer, M.
name: Boyard, J. L.
name: Cabanelas, P.
name: Chernenko, S.
name: Dybczak, A.
name: Epple, E.
name: Fabbietti, L.
name: Fateev, O.
name: Finocchiaro, P.
name: Fonte, P.
name: Friese, J.
name: Fröhlich, I.
name: Galatyuk, T.
name: Garzón, J. A.
name: Gernhäuser, R.
name: Göbel, K.
name: Golubeva, M.
name: González-Díaz, D.
name: Guber, F.
name: Gumberidze, M.
name: Heinz, T.
name: Hennino, T.
name: Holzmann, R.
name: Ierusalimov, A.
name: Iori, I.
name: Ivashkin, A.
name: Jurkovic, M.
name: Kämpfer, B.
name: Karavicheva, T.
name: König, I.
name: König, W.
name: Kolb, B. W.
name: Kornakov, G.
name: Kotte, R.
name: Krása, A.
name: Krizek, F.
name: Krücken, R.
name: Kuc, H.
name: Kühn, W.
name: Kugler, A.
name: Kurepin, A.
name: Ladygin, V.
name: Lalik, R.
name: Lang, S.
name: Lapidus, K.
name: Lebedev, A.
name: Liu, T.
name: Lopes, L.
name: Lorenz, M.
name: Maier, L.
name: Mangiarotti, A.
name: Markert, J.
name: Metag, V.
name: Michalska, B.
name: Michel, J.
name: Müntz, C.
name: Naumann, L.
name: Pachmayer, Y. C.
name: Pałka, M.
name: Parpottas, Y.
name: Pechenov, V.
name: Pechenova, O.
name: Pietraszko, J.
name: Przygoda, W.
name: Ramstein, B.
name: Reshetin, A.
name: Rustamov, A.
name: Sadovsky, A.
name: Salabura, P.
name: Schmah, A.
name: Schwab, E.
name: Siebenson, J.
name: Sobolev, Yu. G.
name: Spataro, S.
name: Spruck, B.
name: Ströbele, H.
name: Stroth, J.
name: Sturm, C.
name: Tarantola, A.
name: Teilab, K.
name: Tlusty, P.
name: Traxler, M.
name: Trebacz, R.
name: Tsertos, H.
name: Vasiliev, T.
name: Wagner, V.
name: Weber, M.
name: Wendisch, C.
name: Wüstenfeld, J.
name: Yurevich, S.
name: Zanevsky, Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences
subject: J.2

description: We 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 $pp \rightarrow npπ^{+}$ and $pp \rightarrow ppπ^{0}$ as well as $pp \rightarrow ppe^{+}e^{-}$ 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 $&lt;2~$ 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 $R\rightarrow pe^+e^-$ decays. Two models of the resonance decays into dielectrons are examined assuming a point-like $RN γ^*$ coupling and the dominance of the $ρ$ 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.
description: 17 pages, 14 figures