Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES

  • HADES Collaboration
  • G. Agakishiev
  • H. Alvarez-Pol
  • A. Balanda
  • R. Bassini
  • M. Böhmer
  • H. Bokemeyer
  • J. L. Boyard
  • P. Cabanelas
  • S. Chernenko
  • T. Christ
  • M. Destefanis
  • F. Dohrmann
  • A. Dybczak
  • T. Eberl
  • L. Fabbietti
  • O. Fateev
  • P. Finocchiaro
  • J. Friese
  • I. Fröhlich
  • T. Galatyuk
  • J. A. Garzón
  • R. Gernhäuser
  • C. Gilardi
  • M. Golubeva
  • D. González-Dıaz
  • F. Guber
  • M. Gumberidze
  • T. Hennino
  • R. Holzmann
  • A. Ierusalimov
  • I. Iori
  • A. Ivashkin
  • M. Jurkovic
  • B. Kämpfer
  • K. Kanaki
  • T. Karavicheva
  • I. Koenig
  • W. Koenig
  • B. W. Kolb
  • R. Kotte
  • A. Kozuch
  • F. Krizek
  • W. Kühn
  • A. Kugler
  • A. Kurepin
  • S. Lang
  • K. Lapidus
  • T. Liu
  • L. Maier
  • J. Markert
  • V. Metag
  • B. Michalska
  • E. Morinière
  • J. Mousa
  • M. Münch
  • C. Müntz
  • L. Naumann
  • J. Otwinowski
  • Y. C. Pachmayer
  • V. Pechenov
  • O. Pechenova
  • T. Pérez Cavalcanti
  • J. Pietraszko
  • V. Pospısil
  • W. Przygoda
  • B. Ramstein
  • A. Reshetin
  • M. Roy-Stephan
  • A. Rustamov
  • A. Sadovsky
  • B. Sailer
  • P. Salabura
  • M. Sánchez
  • A. Schmah
  • E. Schwab
  • Yu. G. Sobolev
  • S. Spataro
  • B. Spruck
  • H. Ströbele
  • J. Stroth
  • C. Sturm
  • A. Tarantola
  • K. Teilab
  • P. Tlusty
  • A. Toia
  • M. Traxler
  • R. Trebacz
  • H. Tsertos
  • V. Wagner
  • M. Wisniowski
  • T. Wojcik
  • J. Wüstenfeld
  • S. Yurevich
  • Y. Zanevsky
  • P. Zumbruch
Open Access
Regular Article - Experimental Physics

Abstract.

We present measurements of exclusive \(\ensuremath \pi^{+,0}\) and \( \eta\) production in pp reactions at 1.25GeV and 2.2GeV beam kinetic energy in hadron and dielectron channels. In the case of \( \pi^{+}_{}\) and \( \pi^{0}_{}\) , high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of \( \Delta\)(1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp\( \rightarrow\)pp\( \eta\) , since controversial data exist at 2.0GeV; we find \(\ensuremath \sigma=0.142\pm0.022\) mb. Using the dielectron channels, the \( \pi^{0}_{}\) and \( \eta\) Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.

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Copyright information

© The Author(s) 2012

Authors and Affiliations

  • HADES Collaboration
  • G. Agakishiev
    • 5
  • H. Alvarez-Pol
    • 15
  • A. Balanda
    • 2
  • R. Bassini
    • 10
  • M. Böhmer
    • 8
  • H. Bokemeyer
    • 3
  • J. L. Boyard
    • 13
  • P. Cabanelas
    • 15
  • S. Chernenko
    • 5
  • T. Christ
    • 8
  • M. Destefanis
    • 9
  • F. Dohrmann
    • 4
  • A. Dybczak
    • 2
  • T. Eberl
    • 8
  • L. Fabbietti
    • 7
  • O. Fateev
    • 5
  • P. Finocchiaro
    • 1
  • J. Friese
    • 8
  • I. Fröhlich
    • 6
  • T. Galatyuk
    • 6
  • J. A. Garzón
    • 15
  • R. Gernhäuser
    • 8
  • C. Gilardi
    • 9
  • M. Golubeva
    • 11
  • D. González-Dıaz
    • 1
  • F. Guber
    • 11
  • M. Gumberidze
    • 13
  • T. Hennino
    • 13
  • R. Holzmann
    • 3
  • A. Ierusalimov
    • 5
  • I. Iori
    • 10
  • A. Ivashkin
    • 11
  • M. Jurkovic
    • 8
  • B. Kämpfer
    • 4
  • K. Kanaki
    • 4
  • T. Karavicheva
    • 11
  • I. Koenig
    • 3
  • W. Koenig
    • 3
  • B. W. Kolb
    • 3
  • R. Kotte
    • 4
  • A. Kozuch
    • 2
  • F. Krizek
    • 14
  • W. Kühn
    • 9
  • A. Kugler
    • 14
  • A. Kurepin
    • 11
  • S. Lang
    • 3
  • K. Lapidus
    • 7
  • T. Liu
    • 13
  • L. Maier
    • 8
  • J. Markert
    • 6
  • V. Metag
    • 9
  • B. Michalska
    • 2
  • E. Morinière
    • 13
  • J. Mousa
    • 12
  • M. Münch
    • 3
  • C. Müntz
    • 6
  • L. Naumann
    • 4
  • J. Otwinowski
    • 2
  • Y. C. Pachmayer
    • 6
  • V. Pechenov
    • 3
  • O. Pechenova
    • 6
  • T. Pérez Cavalcanti
    • 9
  • J. Pietraszko
    • 6
  • V. Pospısil
    • 14
  • W. Przygoda
    • 2
  • B. Ramstein
    • 13
  • A. Reshetin
    • 11
  • M. Roy-Stephan
    • 13
  • A. Rustamov
    • 3
  • A. Sadovsky
    • 11
  • B. Sailer
    • 8
  • P. Salabura
    • 2
  • M. Sánchez
    • 15
  • A. Schmah
    • 1
  • E. Schwab
    • 3
  • Yu. G. Sobolev
    • 14
  • S. Spataro
    • 1
    • 9
  • B. Spruck
    • 9
  • H. Ströbele
    • 6
  • J. Stroth
    • 3
    • 6
  • C. Sturm
    • 3
  • A. Tarantola
    • 6
  • K. Teilab
    • 6
  • P. Tlusty
    • 14
  • A. Toia
    • 9
  • M. Traxler
    • 3
  • R. Trebacz
    • 2
  • H. Tsertos
    • 12
  • V. Wagner
    • 14
  • M. Wisniowski
    • 2
  • T. Wojcik
    • 2
  • J. Wüstenfeld
    • 4
  • S. Yurevich
    • 3
  • Y. Zanevsky
    • 5
  • P. Zumbruch
    • 3
  1. 1.Istituto Nazionale di Fisica NucleareLaboratori Nazionali del SudCataniaItaly
  2. 2.Smoluchowski Institute of PhysicsJagiellonian University of CracowKrakówPoland
  3. 3.GSI Helmholtz-Zentrum für Schwerionenforschung GmbHDarmstadtGermany
  4. 4.Institut für StrahlenphysikHelmholtz-Zentrum Dresden-RossendorfDresdenGermany
  5. 5.Joint Institute of Nuclear ResearchDubnaRussia
  6. 6.Institut für KernphysikGoethe-UniversitätFrankfurtGermany
  7. 7.Excellence Cluster “Origin and Structure of the Universe”GarchingGermany
  8. 8.Physik Department E12Technische Universität MünchenGarchingGermany
  9. 9.II.Physikalisches InstitutJustus Liebig Universität GiessenGiessenGermany
  10. 10.Istituto Nazionale di Fisica NucleareSezione di MilanoMilanoItaly
  11. 11.Institute for Nuclear ResearchRussian Academy of ScienceMoscowRussia
  12. 12.Department of PhysicsUniversity of CyprusNicosiaCyprus
  13. 13.Institut de Physique Nucléaire (UMR 8608)CNRS/IN2P3 - Université Paris SudOrsay CedexFrance
  14. 14.Nuclear Physics InstituteAcademy of Sciences of Czech RepublicRezCzech Republic
  15. 15.Departamento de Fısica de PartıculasUniv. de Santiago de CompostelaSantiago de CompostelaSpain

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