Physics Letters B (Mar 2015)

Partial wave analysis of the reaction p(3.5 GeV)+p→pK+Λ to search for the “ppK−” bound state

  • G. Agakishiev,
  • O. Arnold,
  • 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-Díaz,
  • 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,
  • T. Kunz,
  • A. Kurepin,
  • V. Ladygin,
  • R. Lalik,
  • K. Lapidus,
  • A. Lebedev,
  • L. Lopes,
  • M. Lorenz,
  • L. Maier,
  • A. Mangiarotti,
  • J. Markert,
  • V. Metag,
  • J. Michel,
  • C. Müntz,
  • R. Münzer,
  • 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,
  • H. Tsertos,
  • T. Vasiliev,
  • V. Wagner,
  • M. Weber,
  • C. Wendisch,
  • J. Wüstenfeld,
  • S. Yurevich,
  • Y. Zanevsky,
  • A.V. Sarantsev

Journal volume & issue
Vol. 742
pp. 242 – 248

Abstract

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Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction p(3.5 GeV)+p→pK+Λ. This reaction might contain information about the kaonic cluster “ppK−” (with quantum numbers JP=0− and total isospin I=1/2) via its decay into pΛ. Due to interference effects in our coherent description of the data, a hypothetical K‾NN (or, specifically “ppK−”) cluster signal need not necessarily show up as a pronounced feature (e.g. a peak) in an invariant mass spectrum like pΛ. Our PWA analysis includes a variety of resonant and non-resonant intermediate states and delivers a good description of our data (various angular distributions and two-hadron invariant mass spectra) without a contribution of a K‾NN cluster. At a confidence level of CLs=95% such a cluster cannot contribute more than 2–12% to the total cross section with a pK+Λ final state, which translates into a production cross-section between 0.7 μb and 4.2 μb, respectively. The range of the upper limit depends on the assumed cluster mass, width and production process. Keywords: Kaonic nuclei, Anti-kaon–nucleon physics, ppK−, Low energy QCD, Partial wave analysis