Measurement of γp→ K+Λ and γp→ K+Σ0 at photon energies up to 2 GeV

Associated strangeness production in the reactions γp→ K + Λ 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 s...

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Published inPhysics letters. B Vol. 445; no. 1; pp. 20 - 26
Main Authors 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., Kalinowsky, H., Kirch, U., Klein, F.J., Klein, F., Klempt, E., Kostrewa, D., Kozela, A., Lawall, R., Lindemann, L., Link, J., Manns, J., Mart, T., Menze, D., Merkel, H., Merkel, R., Neuerburg, W., Paganetti, M., Paul, E., Plötzke, R., Schenk, U., Scholmann, J., Schulday, I., Schumacher, M., Schütz, P., Schwille, W.J., Smend, F., Smyrski, J., Speth, W., Tran, H.N., van Pee, H., Vogl, W., Wedemeyer, R., Wehnes, F., Wiegers, B., Wieland, F.W., Wißkirchen, J., Wolf, A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.1998
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Summary:Associated strangeness production in the reactions γp→ K + Λ 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.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(98)01393-8