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

  • G. Agakishiev
  • A. Balanda
  • D. Belver
  • A. Belyaev
  • J. C. Berger-Chen
  • A. Blanco
  • M. Böhmer
  • J. L. Boyard
  • P. Cabanelas
  • S. Chernenko
  • A. Dybczak
  • E. Epple
  • L. Fabbietti
  • O. Fateev
  • P. Finocchiaro
  • P. Fonte
  • J. Friese
  • I. Fröhlich
  • T. Galatyuk
  • J. A. Garzón
  • R. Gernhäuser
  • K. Göbel
  • M. Golubeva
  • D. González-Dıaz
  • F. Guber
  • M. Gumberidze
  • T. Heinz
  • T. Hennino
  • R. Holzmann
  • A. Ierusalimov
  • I. Iori
  • A. Ivashkin
  • M. Jurkovic
  • B. Kämpfer
  • T. Karavicheva
  • I. Koenig
  • W. Koenig
  • B. W. Kolb
  • G. Kornakov
  • R. Kotte
  • A. Krása
  • F. Krizek
  • R. Krücken
  • H. Kuc
  • W. Kühn
  • 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. Müntz
  • 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
  • Yu. G. Sobolev
  • S. Spataro
  • B. Spruck
  • H. Ströbele
  • 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. Wüstenfeld
  • S. Yurevich
  • Y. Zanevsky
Open Access
Regular Article - Experimental Physics

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/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 \( R\rightarrow pe^{+}e^{-}\) 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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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • G. Agakishiev
    • 7
  • A. Balanda
    • 3
  • D. Belver
    • 18
  • A. Belyaev
    • 7
  • J. C. Berger-Chen
    • 9
  • A. Blanco
    • 2
  • M. Böhmer
    • 10
  • J. L. Boyard
    • 16
  • P. Cabanelas
    • 18
  • S. Chernenko
    • 7
  • A. Dybczak
    • 3
  • E. Epple
    • 9
  • L. Fabbietti
    • 9
  • O. Fateev
    • 7
  • P. Finocchiaro
    • 1
  • P. Fonte
    • 2
  • J. Friese
    • 10
  • I. Fröhlich
    • 8
  • T. Galatyuk
    • 5
  • J. A. Garzón
    • 18
  • R. Gernhäuser
    • 10
  • K. Göbel
    • 8
  • M. Golubeva
    • 13
  • D. González-Dıaz
    • 5
  • F. Guber
    • 13
  • M. Gumberidze
    • 5
  • T. Heinz
    • 4
  • T. Hennino
    • 16
  • R. Holzmann
    • 4
  • A. Ierusalimov
    • 7
  • I. Iori
    • 12
  • A. Ivashkin
    • 13
  • M. Jurkovic
    • 10
  • B. Kämpfer
    • 6
  • T. Karavicheva
    • 13
  • I. Koenig
    • 4
  • W. Koenig
    • 4
  • B. W. Kolb
    • 4
  • G. Kornakov
    • 5
  • R. Kotte
    • 6
  • A. Krása
    • 17
  • F. Krizek
    • 17
  • R. Krücken
    • 10
  • H. Kuc
    • 3
    • 16
  • W. Kühn
    • 11
  • A. Kugler
    • 17
  • A. Kurepin
    • 13
  • V. Ladygin
    • 7
  • R. Lalik
    • 9
  • S. Lang
    • 4
  • K. Lapidus
    • 9
  • A. Lebedev
    • 14
  • T. Liu
    • 16
  • L. Lopes
    • 2
  • M. Lorenz
    • 8
  • L. Maier
    • 10
  • A. Mangiarotti
    • 2
  • J. Markert
    • 8
  • V. Metag
    • 11
  • B. Michalska
    • 3
  • J. Michel
    • 8
  • C. Müntz
    • 8
  • L. Naumann
    • 6
  • Y. C. Pachmayer
    • 8
  • M. Palka
    • 3
  • Y. Parpottas
    • 15
  • V. Pechenov
    • 4
  • O. Pechenova
    • 8
  • J. Pietraszko
    • 4
  • W. Przygoda
    • 3
  • B. Ramstein
    • 16
  • A. Reshetin
    • 13
  • A. Rustamov
    • 8
  • A. Sadovsky
    • 13
  • P. Salabura
    • 3
  • A. Schmah
    • 1
  • E. Schwab
    • 4
  • J. Siebenson
    • 9
  • Yu. G. Sobolev
    • 17
  • S. Spataro
    • 1
  • B. Spruck
    • 11
  • H. Ströbele
    • 8
  • J. Stroth
    • 8
    • 4
  • C. Sturm
    • 4
  • A. Tarantola
    • 8
  • K. Teilab
    • 8
  • P. Tlusty
    • 17
  • M. Traxler
    • 4
  • R. Trebacz
    • 3
  • H. Tsertos
    • 15
  • T. Vasiliev
    • 7
  • V. Wagner
    • 17
  • M. Weber
    • 10
  • C. Wendisch
    • 6
  • J. Wüstenfeld
    • 6
  • S. Yurevich
    • 4
  • Y. Zanevsky
    • 7
  1. 1.INFNLaboratori Nazionali del SudCataniaItaly
  2. 2.LIP-Laboratório de Instrumentação e Física Experimental de PartículasCoimbraPortugal
  3. 3.Smoluchowski Institute of PhysicsJagiellonian University of CracowKrakówPoland
  4. 4.GSI Helmholtzzentrum für Schwerionenforschung GmbHDarmstadtGermany
  5. 5.Technische Universität DarmstadtDarmstadtGermany
  6. 6.Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-RossendorfDresdenGermany
  7. 7.Joint Institute of Nuclear ResearchDubnaRussia
  8. 8.Institut für KernphysikGoethe-UniversitätFrankfurtGermany
  9. 9.Excellence Cluster “Origin and Structure of the Universe”GarchingGermany
  10. 10.Physik Department E12Technische Universität MünchenGarchingGermany
  11. 11.II.Physikalisches InstitutJustus Liebig Universität GiessenGiessenGermany
  12. 12.INFNSezione di MilanoMilanoItaly
  13. 13.Institute for Nuclear ResearchRussian Academy of ScienceMoscowRussia
  14. 14.Institute of Theoretical and Experimental PhysicsMoscowRussia
  15. 15.Department of PhysicsUniversity of CyprusNicosiaCyprus
  16. 16.Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3Université Paris SudOrsay CedexFrance
  17. 17.Nuclear Physics InstituteAcademy of Sciences of Czech RepublicRezCzech Republic
  18. 18.LabCAF. F. FísicaUniv. de Santiago de CompostelaSantiago de CompostelaSpain

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