ITA
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Measurement of gamma p -> K+ Lambda and gamma p -> K+Sigma(0) at photon energies up to 2 GeV

Authors

Tran, MQ Barth, J Bennhold, C Bockhorst, M Braun, W Budzanowski, A Burbach, G Burgwinkel, R Ernst, J Glander, KH Goers, S Guse, B Haas, KM Hannappel, J Heinloth, K Honscheid, K Jahnen, T Jopen, N Jungst, H Kalinowsky, H Kirch, U Klein, FJ 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 Plotzke, R Schenk, U Scholmann, J Schulday, I Schumacher, M Schutz, P Schwille, WJ Smend, F Smyrski, J Speth, W Tran, HN van Pee, H Vogl, V Wedemeyer, R Wehnes, F Wiegers, B Wieland, FW Wisskirchen, J Wolf, A

Citation

Mq. Tran et al., Measurement of gamma p -> K+ Lambda and gamma p -> K+Sigma(0) at photon energies up to 2 GeV, PHYS LETT B, 445(1-2), 1998, pp. 20-26

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICS LETTERS B

ISSN journal

03702693 → ACNP

Volume

445

Issue

1-2

Year of publication

1998

Pages

20 - 26

Database

ISI

SICI code

0370-2693(199812)445:1-2<20:MOGP-K>2.0.ZU;2-G

Abstract

Associated strangeness production in the reactions gamma p --> K+ Lambda an d gamma p --> K(+)Sigma(0) was measured with the SAPHIR detector at the ele ctron stretcher ring ELSA at Bonn. Data on total and differential cross sec tions and on hyperon polarizations are presented. The total cross section f or Lambda production shows a strong threshold enhancement whereas the Sigma (0) data have a maximum at about E-gamma = 1.45 GeV. Along with the angular decomposition of the differential cross section into polynomials, this sug gests resonance production. However, the angular distributions of both hype ron polarizations vary only slightly with the photon energy, Lambda and Sig ma(0) polarizations show opposite signs and change sign over the angular ra nge. (C) 1998 Elsevier Science B.V. All rights reserved.