Measurement of \(\gamma p \rightarrow K^ + \Lambda\) and \(\gamma p \rightarrow K^ + \Sigma^0\) at photon energies up to 2.6 GeV

  • K.-H. Glander
  • J. Barth
  • W. Braun
  • J. Hannappel
  • N. Jöpen
  • F. Klein
  • E. Klempt
  • R. Lawall
  • J. Link
  • D. Menze
  • W. Neuerburg
  • M. Ostrick
  • E. Paul
  • I. Schulday
  • W. J. Schwille
  • H. v. Pee
  • F. W. Wieland
  • J. Wißkirchen
  • C. Wu
Article

Abstract.

The reactions \(\gamma p \rightarrow K^ + \Lambda\) and \(\gamma p \rightarrow K^ + \Sigma^0\) were measured in the energy range from threshold up to a photon energy of 2.6 GeV. The data were taken with the SAPHIR detector at the electron stretcher facility, ELSA. Results on cross-sections and hyperon polarizations are presented as a function of the kaon production angle and the photon energy. The total cross-section for \(\Lambda\) production rises steeply with energy close to threshold, whereas the \(\Sigma^0\) cross-section rises slowly to a maximum at about \(E_\gamma = 1.45\) GeV. Cross-sections together with their angular decompositions into Legendre polynomials suggest contributions from resonance production for both reactions. In general, the induced polarization of \(\Lambda\) has negative values in the kaon forward direction and positive values in the backward direction. The magnitude varies with energy. The polarization of \(\Sigma^0\) follows a similar angular and energy dependence as that of \(\Lambda\), but with opposite sign.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  • K.-H. Glander
    • 1
  • J. Barth
    • 1
  • W. Braun
    • 1
  • J. Hannappel
    • 1
  • N. Jöpen
    • 1
  • F. Klein
    • 1
  • E. Klempt
    • 2
  • R. Lawall
    • 1
  • J. Link
    • 2
  • D. Menze
    • 1
  • W. Neuerburg
    • 1
  • M. Ostrick
    • 1
  • E. Paul
    • 1
  • I. Schulday
    • 1
  • W. J. Schwille
    • 1
  • H. v. Pee
    • 2
  • F. W. Wieland
    • 1
  • J. Wißkirchen
    • 1
  • C. Wu
    • 1
  1. 1.Physikalisches InstitutBonn UniversityBonnGermany
  2. 2.Helmholtz-Institut für Strahlen- und KernphysikBonn UniversityBonnGermany

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