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Study of the reaction γp → K+Λ(1520) at photon energies up to 2.65 GeV

  • F. W. Wieland
  • J. Barth
  • K. -H. Glander
  • J. Hannappel
  • N. Jöpen
  • F. Klein
  • E. Klempt
  • R. Lawall
  • D. Menze
  • M. Ostrick
  • E. Paul
  • I. Schulday
  • W. J. Schwille
Regular Article - Experimental Physics

Abstract

The reaction γpK + Λ(1520) was measured in the energy range from threshold to 2.65 GeV with the SAPHIR detector at the electron stretcher facility ELSA in Bonn. The Λ(1520) production cross-section was analyzed in the decay modes pK , \( n\bar K^0 \), Σ ± π , and Λπ + π as a function of the photon energy and the squared four-momentum transfer t . While the cross-sections for the inclusive reactions rise steadily with energy, the cross-section of the process γpK + Λ(1520) peaks at a photon energy of about 2.0 GeV, falls off exponentially with t , and shows a slope flattening with increasing photon energy. The angular distributions in the t-channel helicity system indicate neither a K nor a K * exchange dominance. Rather, the rapid change of the angular distribution with energy suggests that, in addition to t -channel K and K* exchange, amplitudes for formation of nucleon resonances in the s-channel play an important role.

Keywords

Photon Energy Angular Distribution Invariant Mass Decay Channel Primary Vertex 
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

© SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • F. W. Wieland
    • 1
  • J. Barth
    • 1
  • K. -H. Glander
    • 1
  • J. Hannappel
    • 1
  • N. Jöpen
    • 1
  • F. Klein
    • 1
  • E. Klempt
    • 2
  • R. Lawall
    • 1
  • D. Menze
    • 1
  • M. Ostrick
    • 3
  • E. Paul
    • 1
  • I. Schulday
    • 1
  • W. J. Schwille
    • 1
  1. 1.Physikalisches Institut der Universität BonnBonnGermany
  2. 2.Helmholtz-Institut für Strahlen- und KernphysikUniversität BonnBonnGermany
  3. 3.Institut für KernphysikUniversität MainzMainzGermany

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