/ nucl-ex arXiv:1403.3054

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

Agakishiev, G. (Dubna, JINR) ; Balanda, A. (Jagiellonian U.) ; Belver, D. (Santiago de Compostela U.) ; Belyaev, A. (Dubna, JINR) ; Berger-Chen, J.C. (Munich, Tech. U., Universe) ; Blanco, A. (LIP, Lisbon) ; Böhmer, M. (Munich, Tech. U.) ; Boyard, J.L. (Orsay, IPN) ; Cabanelas, P. (Santiago de Compostela U.) ; Chernenko, S. (Dubna, JINR) ; Dybczak, A. (Jagiellonian U.) ; Epple, E. (Munich, Tech. U., Universe) ; Fabbietti, L. (Munich, Tech. U., Universe) ; Fateev, O. (Dubna, JINR) ; Finocchiaro, P. (INFN, LNS) ; Fonte, P. (Coimbra Inst. Sup. Eng.) ; Friese, J. (Munich, Tech. U.) ; Fröhlich, I. (Frankfurt U., Inst. Kernphys.) ; Galatyuk, T. (Darmstadt, EMMI) ; Garzón, J.A. (Santiago de Compostela U.) ; Gernhäuser, R. (Munich, Tech. U.) ; Göbel, K. (Frankfurt U., Inst. Kernphys.) ; Golubeva, M. (Moscow, INR) ; González-Díaz, D. (Darmstadt, Tech. U.) ; Guber, F. (Moscow, INR) ; Gumberidze, M. (Darmstadt, EMMI) ; Heinz, T. (Darmstadt, GSI) ; Hennino, T. (Orsay, IPN) ; Holzmann, R. (Darmstadt, GSI) ; Ierusalimov, A. (Dubna, JINR) ; Iori, I. (Milan U.) ; Ivashkin, A. (Moscow, INR) ; Jurkovic, M. (Munich, Tech. U.) ; Kämpfer, B. (Dresden, Tech. U.) ; Karavicheva, T. (Moscow, INR) ; König, I. (Darmstadt, GSI) ; König, W. (Darmstadt, GSI) ; Kolb, B.W. (Darmstadt, GSI) ; Kornakov, G. (Darmstadt, Tech. U.) ; Kotte, R. (Forschungszentrum Dresden Rossendorf) ; Krása, A. (Rez, Nucl. Phys. Inst.) ; Krizek, F. (Rez, Nucl. Phys. Inst.) ; Krücken, R. (Munich, Tech. U.) ; Kuc, H. (Orsay, IPN) ; Kühn, W. (Giessen U.) ; Kugler, A. (Rez, Nucl. Phys. Inst.) ; Kurepin, A. (Moscow, INR) ; Ladygin, V. (Dubna, JINR) ; Lalik, R. (Munich, Tech. U., Universe) ; Lang, S. (Darmstadt, GSI) ; Lapidus, K. (Munich, Tech. U., Universe) ; Lebedev, A. (Moscow, ITEP) ; Liu, T. (Orsay, IPN) ; Lopes, L. (LIP, Lisbon) ; Lorenz, M. (Darmstadt, EMMI) ; Maier, L. (Munich, Tech. U.) ; Mangiarotti, A. (LIP, Lisbon) ; Markert, J. (Frankfurt U., Inst. Kernphys.) ; Metag, V. (Giessen U.) ; Michalska-Trebacz, B. (Jagiellonian U.) ; Michel, J. (Frankfurt U., Inst. Kernphys.) ; Müntz, C. (Frankfurt U., Inst. Kernphys.) ; Naumann, L. (Forschungszentrum Dresden Rossendorf) ; Pachmayer, Y.C. (Frankfurt U., Inst. Kernphys.) ; Pa\lka, M. (Jagiellonian U.) ; Parpottas, Y. (Frederick Inst. Tech.) ; Pechenov, V. (Darmstadt, GSI) ; Pechenova, O. (Frankfurt U., Inst. Kernphys.) ; Pietraszko, J. (Darmstadt, GSI) ; Przygoda, W. (Jagiellonian U.) ; Ramstein, B. (Orsay, IPN) ; Reshetin, A. (Moscow, INR) ; Rustamov, A. (Frankfurt U., Inst. Kernphys.) ; Sadovsky, A. (Moscow, INR) ; Salabura, P. (Jagiellonian U.) ; Schmah, A. (LBL, Berkeley) ; Schwab, E. (Darmstadt, GSI) ; Siebenson, J. (Munich, Tech. U., Universe) ; Sobolev, Yu. G. (Rez, Nucl. Phys. Inst.) ; Spataro, S. (INFN, Turin; Turin U.) ; Spruck, B. (Giessen U.) ; Ströbele, H. (Frankfurt U., Inst. Kernphys.) ; Stroth, J. (Darmstadt, GSI) ; Sturm, C. (Darmstadt, GSI) ; Tarantola, A. (Frankfurt U., Inst. Kernphys.) ; Teilab, K. (Frankfurt U., Inst. Kernphys.) ; Tlusty, P. (Rez, Nucl. Phys. Inst.) ; Traxler, M. (Darmstadt, GSI) ; Trebacz, R. (Jagiellonian U.) ; Tsertos, H. (Cyprus U.) ; Vasiliev, T. (Dubna, JINR) ; Wagner, V. (Rez, Nucl. Phys. Inst.) ; Weber, M. (Munich, Tech. U.) ; Wendisch, C. (Dresden, Tech. U.) ; Wüstenfeld, J. (Forschungszentrum Dresden Rossendorf) ; Yurevich, S. (Darmstadt, GSI) ; Zanevsky, Y. (Dubna, JINR)

Pages: 17

Abstract: 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 $pp \rightarrow np\pi^{+}$ and $pp \rightarrow pp\pi^{0}$ 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 $<2~$ 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 $RN \gamma^*$ 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.

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Note: *Brief entry*; *Temporary entry*; 17 pages, 14 figures

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