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Title: Partial wave analysis of the reaction p(3.5 GeV) + p → pK+ Λ to search for the "ppK" bound state

Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction p(3.5GeV) + 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.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [2] ;  [4] ;  [5] ;  [6] ;  [3] ;  [1] ;  [7] ;  [2] ;  [2] ;  [1] ;  [8] ;  [9] ;  [5] ;  [10] ;  [11] ;  [3] more »;  [5] ;  [10] ;  [12] ;  [13] ;  [12] ;  [11] ;  [14] ;  [6] ;  [14] ;  [1] ;  [15] ;  [12] ;  [5] ;  [16] ;  [12] ;  [14] ;  [14] ;  [14] ;  [13] ;  [17] ;  [18] ;  [18] ;  [5] ;  [19] ;  [20] ;  [18] ;  [5] ;  [12] ;  [1] ;  [2] ;  [2] ;  [21] ;  [4] ;  [10] ;  [5] ;  [4] ;  [10] ;  [20] ;  [10] ;  [10] ;  [2] ;  [17] ;  [10] ;  [7] ;  [22] ;  [14] ;  [10] ;  [14] ;  [7] ;  [6] ;  [12] ;  [10] ;  [12] ;  [7] ;  [23] ;  [14] ;  [5] ;  [18] ;  [24] ;  [20] ;  [10] ;  [25] ;  [14] ;  [10] ;  [10] ;  [18] ;  [14] ;  [26] ;  [27] ;  [18] ;  [5] ;  [16] ;  [17] ;  [14] ;  [1] ;  [28] « less
  1. Joint Institute of Nuclear Research, Dubna (Russia)
  2. Excellence Cluster 'Origin and Structure of the Universe', Garching (Germany); Technische Univ. Munchen, Garching (Germany)
  3. Univ. de Santiago de Compostela, Santiago de Compostela (Spain)
  4. LIP-Laboratorio de Instrumentacao e Fisica Experimental de Particulas, Coimbra (Portugal)
  5. Technische Univ. Munchen, Garching (Germany)
  6. Univ. Paris Sud, Orsay Cedex (France)
  7. Jagiellonian Univ. of Cracow, Krakow (Poland)
  8. Istituto Nazionale di Fisica Nucleare, Catania (Italy)
  9. LIP-Laboratorio de Instrumentacao e Fisica Experimental de Particulas, Coimbra (Portugal); ISEC Coimbra, Coimbra (Portugal)
  10. Goethe Univ., Frankfurt (Germany)
  11. Technische Univ. Darmstadt, Darmstadt (Germany); ExtreMe Matter Institute, EMMI, Darmstadt (Germany)
  12. Russian Academy of Sciences (RAS), Moscow (Russian Federation)
  13. Technische Univ. Darmstadt, Darmstadt (Germany)
  14. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  15. Instituto Nazionale di Fisica Nucleare, Milano (Italy); Univ. di Milano, Milano (Italy)
  16. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Technische Univ. Dresden, Dresden (Germany)
  17. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  18. Academy of Sciences of Czech Republic, Rez, (Czech Republic)
  19. Jagiellonian Univ. of Cracow, Krakow (Poland); Univ. Paris Sud, Orsay Cedex (France)
  20. Justus Liebig Univ. Giessen, Giessen (Germany)
  21. Institute of Theoretical and Experimental Physics, Moscow (Russia)
  22. Univ. of Cyprus, Nicosia (Cyprus); Frederick Univ., Nicosia (Cyprus)
  23. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  24. Univ. di Torino, Torino (Italy)
  25. Goethe Univ., Frankfurt (Germany); GSI Helmholtzzentrum fur Schwerionenforschung, GmbH, Darmstadt (Germany)
  26. Univ. of Cyprus, Nicosia (Cyprus)
  27. Joint of Nuclear Research, Dubna (Russia)
  28. Peterburg Nuclear Physics Institute, Gatchina (Russia)
Publication Date:
OSTI Identifier:
1209926
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 742; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS kaonic nuclei; anti-kaon–nucleon physics; ppK−; low energy QCD; partial wave analysis