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Deep sub-threshold K*(892)0 production in collisions of Ar + KCl at 1.76 A GeV

  • The HADES Collaboration
  • G. Agakishiev
  • A. Balanda
  • R. Bassini
  • D. Belver
  • A. V. Belyaev
  • A. Blanco
  • M. Böhmer
  • J. L. Boyard
  • P. Cabanelas
  • E. Castro
  • S. Chernenko
  • T. Christ
  • M. Destefanis
  • J. Díaz
  • F. Dohrmann
  • A. Dybczak
  • T. Eberl
  • E. Epple
  • L. Fabbietti
  • O. V. Fateev
  • P. Finocchiaro
  • P. Fonte
  • J. Friese
  • I. Fröhlich
  • T. Galatyuk
  • J. A. Garzón
  • R. Gernhäuser
  • A. Gil
  • C. Gilardi
  • M. Golubeva
  • D. González-Díaz
  • F. Guber
  • M. Gumberidze
  • M. Heilmann
  • T. Heinz
  • T. Hennino
  • R. Holzmann
  • P. Huck
  • I. Iori
  • A. Ivashkin
  • M. Jurkovic
  • B. Kämpfer
  • K. Kanaki
  • T. Karavicheva
  • D. Kirschner
  • I. Koenig
  • W. Koenig
  • B. W. Kolb
  • R. Kotte
  • F. Krizek
  • R. Krücken
  • W. Kühn
  • A. Kugler
  • A. Kurepin
  • S. Lang
  • J. S. Lange
  • K. Lapidus
  • T. Liu
  • L. Lopes
  • M. Lorenz
  • L. Maier
  • A. Mangiarotti
  • J. Markert
  • V. Metag
  • B. Michalska
  • J. Michel
  • D. Mishra
  • E. Morinière
  • J. Mousa
  • C. Müntz
  • L. Naumann
  • J. Otwinowski
  • Y. C. Pachmayer
  • M. Palka
  • Y. Parpottas
  • V. Pechenov
  • O. Pechenova
  • T. Pérez Cavalcanti
  • J. Pietraszko
  • W. Przygoda
  • B. Ramstein
  • A. Reshetin
  • M. Roy-Stephan
  • A. Rustamov
  • A. Sadovsky
  • B. Sailer
  • 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
  • V. Wagner
  • M. Weber
  • C. Wendisch
  • M. Wisniowski
  • T. Wojcik
  • J. Wüstenfeld
  • S. Yurevich
  • Y. V. Zanevsky
  • P. Zumbruch
Open Access
Regular Article - Experimental Physics

Abstract.

Results on the deep sub-threshold production of the short-lived hadronic resonance K*(892)0 are reported for collisions of Ar + KCl at 1.76A GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The K*(892)0 production probability per central collision of \( P_{K^{*0}}=(4.4\pm 1.1 \pm 0.5)\times 10^{-4}\) and the K*(892)0/K0 ratio of \( P_{K^{*0}}/P_{K^0}=(1.9\pm 0.5\pm 0.3)\times 10^{-2}\) are determined at the lowest energy so far (i.e. deep below the threshold for the corresponding production in nucleon-nucleon collisions, \( \sqrt{s_{NN}}-\sqrt{s_{thr}}=-340\) MeV). The K*0/K0 ratio is compared with results of other experiments and with the predictions of the UrQMD transport approach and of the statistical hadronization model. The experimental K*0 yield and the K*0/K0 ratio are overestimated by the transport model by factors of about five and two, respectively. In a chemically equilibrated medium the ratio corresponds to a temperature of the thermalized system being systematically lower than the value determined by the yields of the stable and long-lived hadrons produced in Ar + KCl collisions. From the present measurement, we conclude that sub-threshold K* production either cannot be considered to proceed in a system being in thermal equilibrium or these short-lived resonances appear undersaturated, for example as a result of the rescattering of the decay particles in the ambient hadronic medium.

Keywords

Combinatorial Background NA49 Collaboration Track Candidate Statistical Hadronization Model Impact Parameter Distribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • The HADES Collaboration
  • G. Agakishiev
    • 8
  • A. Balanda
    • 3
  • R. Bassini
    • 9
  • D. Belver
    • 15
  • A. V. Belyaev
    • 6
  • A. Blanco
    • 2
  • M. Böhmer
    • 11
  • J. L. Boyard
    • 13
  • P. Cabanelas
    • 15
  • E. Castro
    • 15
  • S. Chernenko
    • 6
  • T. Christ
    • 11
  • M. Destefanis
    • 8
  • J. Díaz
    • 16
  • F. Dohrmann
    • 5
  • A. Dybczak
    • 3
  • T. Eberl
    • 11
  • E. Epple
    • 11
  • L. Fabbietti
    • 11
  • O. V. Fateev
    • 6
  • P. Finocchiaro
    • 1
  • P. Fonte
    • 2
  • J. Friese
    • 11
  • I. Fröhlich
    • 7
  • T. Galatyuk
    • 7
  • J. A. Garzón
    • 15
  • R. Gernhäuser
    • 11
  • A. Gil
    • 16
  • C. Gilardi
    • 8
  • M. Golubeva
    • 10
  • D. González-Díaz
    • 4
  • F. Guber
    • 10
  • M. Gumberidze
    • 13
  • M. Heilmann
    • 7
  • T. Heinz
    • 4
  • T. Hennino
    • 13
  • R. Holzmann
    • 4
  • P. Huck
    • 11
  • I. Iori
    • 9
  • A. Ivashkin
    • 10
  • M. Jurkovic
    • 11
  • B. Kämpfer
    • 5
  • K. Kanaki
    • 5
  • T. Karavicheva
    • 10
  • D. Kirschner
    • 8
  • I. Koenig
    • 4
  • W. Koenig
    • 4
  • B. W. Kolb
    • 4
  • R. Kotte
    • 5
  • F. Krizek
    • 14
  • R. Krücken
    • 11
  • W. Kühn
    • 8
  • A. Kugler
    • 14
  • A. Kurepin
    • 10
  • S. Lang
    • 4
  • J. S. Lange
    • 8
  • K. Lapidus
    • 10
  • T. Liu
    • 13
  • L. Lopes
    • 2
  • M. Lorenz
    • 7
  • L. Maier
    • 11
  • A. Mangiarotti
    • 2
  • J. Markert
    • 7
  • V. Metag
    • 8
  • B. Michalska
    • 3
  • J. Michel
    • 7
  • D. Mishra
    • 8
  • E. Morinière
    • 13
  • J. Mousa
    • 12
  • C. Müntz
    • 7
  • L. Naumann
    • 5
  • J. Otwinowski
    • 3
  • Y. C. Pachmayer
    • 7
  • M. Palka
    • 4
  • Y. Parpottas
    • 12
  • V. Pechenov
    • 4
  • O. Pechenova
    • 8
  • T. Pérez Cavalcanti
    • 8
  • J. Pietraszko
    • 4
  • W. Przygoda
    • 3
  • B. Ramstein
    • 13
  • A. Reshetin
    • 10
  • M. Roy-Stephan
    • 13
  • A. Rustamov
    • 4
  • A. Sadovsky
    • 10
  • B. Sailer
    • 11
  • P. Salabura
    • 3
  • A. Schmah
    • 11
  • E. Schwab
    • 4
  • J. Siebenson
    • 11
  • Yu. G. Sobolev
    • 14
  • S. Spataro
    • 8
  • B. Spruck
    • 8
  • H. Ströbele
    • 7
  • J. Stroth
    • 7
    • 4
  • C. Sturm
    • 4
  • A. Tarantola
    • 7
  • K. Teilab
    • 7
  • P. Tlusty
    • 14
  • M. Traxler
    • 4
  • R. Trebacz
    • 3
  • H. Tsertos
    • 12
  • V. Wagner
    • 14
  • M. Weber
    • 11
  • C. Wendisch
    • 5
  • M. Wisniowski
    • 3
  • T. Wojcik
    • 3
  • J. Wüstenfeld
    • 5
  • S. Yurevich
    • 4
  • Y. V. Zanevsky
    • 6
  • P. Zumbruch
    • 4
  1. 1.Instituto Nazionale di Fisica NucleareLaboratori 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.Institut für StrahlenphysikHelmholtz-Zentrum Dresden-RossendorfDresdenGermany
  6. 6.Joint Institute of Nuclear ResearchDubnaRussia
  7. 7.Institut für KernphysikJohann Wolfgang Goethe-UniversitätFrankfurtGermany
  8. 8.II.Physikalisches InstitutJustus Liebig Universität GiessenGiessenGermany
  9. 9.Istituto Nazionale di Fisica NucleareSezione di MilanoMilanoItaly
  10. 10.Institute for Nuclear ResearchRussian Academy of ScienceMoscowRussia
  11. 11.Physik Department E12Technische Universität MünchenMünchenGermany
  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 Física de PartículasUniv. de Santiago de CompostelaSantiago de CompostelaSpain
  16. 16.Instituto de Física CorpuscularUniversidad de Valencia-CSICValenciaSpain

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