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

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
43
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → 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.