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.

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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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