Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV
Date
2014Author
Krücken, R.Agakishiev, G.
Bałanda, A.
Belver, D.
Belyaev, A.
Berger-Chen, J. C.
Blanco, A.
Böhmer, M.
Boyard, J. L.
Cabanelas, Pablo
Chernenko, S.
Dybczak, A.
Epple, E.
Fabbietti, L.
Fateev, O.
Finocchiaro, P.
Fonte, P.
Friese, J.
Fröhlich, I.
Galatyuk, T.
Garźon, J. A.
Gernhäuser, R.
Göbel, K.
Golubeva, M.
Gonźalez-D́iaz, D.
Guber, F.
Gumberidze, M.
Heinz, T.
Hennino, T.
Holzmann, R.
Ierusalimov, A.
Iori, I.
Ivashkin, A.
Jurkovic, M.
Kämpfer, B.
Karavicheva, T.
Koenig, I.
Koenig, W.
Kolb, B. W.
Kornakov, G.
Kotte, R.
Krása, Antonín
Krizek, F.
Kuc, H.
Kühn, W.
Kugler, A.
Kurepin, A.
Ladygin, V.
Lalik, R.
Lang, S.
Lapidus, K.
Lebedev, A.
Liu, T.
Lopes, L.
Lorenz, M.
Maier, L.
Mangiarott, A.
Markert, J.
Metag, V.
Michalska, B.
Miche, J.
M̈untz, C.
Naumann, L.
Pachmayer, Y. C.
Palka, M.
Parpottas, Yiannis
Pechenov, V.
Pechenova, O.
Pietraszko, J.
Przygoda, W.
Ramstein, B.
Reshetin, A.
Rustamov, A.
Sadovsky, A.
Salabura, P.
Schmah, A.
Schwab, E.
Siebenson, J.
Sobolev, Y. G.
Spataroh, S.
Spruck, B.
Str̈obele, H.
Stroth, J.
Sturm, C.
Tarantola, A.
Teilab, K.
Tlusty, P.
Traxler, M.
Trebacz, R.
Tsertos, Haralambos
Vasiliev, T.
Wagner, V.
Weber, M.
Wendisch, C.
Ẅustenfeld, J.
Yurevich, S.
Zanevsky, Y.
ISSN
1434-6001Source
European Physical Journal AVolume
50Issue
5Pages
1-16Google Scholar check
Metadata
Show full item recordAbstract
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 → npπ+ and pp → ppπ0 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/c2. 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 RNγ* 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. © The Author(s) 2014.