Measurement of γp → K + Λ and γp → K + Σ 0 at photon energies up to 2 GeV

M. Q. Tran, J. Barth, C. Bennhold, M. Bockhorst, W. Braun, A. Budzanowski, G. Burbach, R. Burgwinkel, J. Ernst, K. H. Glander, S. Goers, B. Guse, K. M. Haas, J. Hannappel, K. Heinloth, K. Honscheid, T. Jahnen, N. Jöpen, H. Jüngst, H. KalinowskyU. Kirch, F. J. Klein, F. Klein, E. Klempt, D. Kostrewa, A. Kozela, R. Lawall, L. Lindemann, J. Link, J. Manns, Terry Mart, D. Menze, H. Merkel, R. Merkel, W. Neuerburg, M. Paganetti, E. Paul, R. Plötzke, U. Schenk, J. Scholmann, I. Schulday, M. Schumacher, P. Schütz, W. J. Schwille, F. Smend, J. Smyrski, W. Speth, H. N. Tran, H. Van Pee, W. Vogl, R. Wedemeyer, F. Wehnes, B. Wiegers, F. W. Wieland, J. Wißkirchen, A. Wolf

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Associated strangeness production in the reactions γp → K + A and γp → K + Σ 0 was measured with the SAPHIR detector at the electron stretcher ring ELSA at Bonn. Data on total and differential cross sections and on hyperon polarizations are presented. The total cross section for Λ production shows a strong threshold enhancement whereas the Σ 0 data have a maximum at about E γ = 1.45 GeV. Along with the angular decomposition of the differential cross section into polynomials, this suggests resonance production. However, the angular distributions of both hyperon polarizations vary only slightly with the photon energy. Λ and Σ 0 polarizations show opposite signs and change sign over the angular range.

Original languageEnglish
Pages (from-to)20-26
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 31 Dec 1998


  • Cross sections
  • Hyperons
  • Photoproduction
  • Polarizations
  • Strangeness

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    Tran, M. Q., Barth, J., Bennhold, C., Bockhorst, M., Braun, W., Budzanowski, A., Burbach, G., Burgwinkel, R., Ernst, J., Glander, K. H., Goers, S., Guse, B., Haas, K. M., Hannappel, J., Heinloth, K., Honscheid, K., Jahnen, T., Jöpen, N., Jüngst, H., ... Wolf, A. (1998). Measurement of γp → K + Λ and γp → K + Σ 0 at photon energies up to 2 GeV Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 445(1-2), 20-26.