Comparison of Lambda and Sigma(0) production near threshold in proton-proton collisions

Citation
S. Sewerin et al., Comparison of Lambda and Sigma(0) production near threshold in proton-proton collisions, PHYS REV L, 83(4), 1999, pp. 682-685
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
83
Issue
4
Year of publication
1999
Pages
682 - 685
Database
ISI
SICI code
0031-9007(19990726)83:4<682:COLASP>2.0.ZU;2-Q
Abstract
Threshold measurements of the associated strangeness production reactions p p --> pK(+)Lambda and pp --> pK(+)Sigma(0) are presented. The most remarkab le feature of the data is that at the same excess energy the total cross se ction for the Sigma(0) production appears to be about a factor of 28(-9)(+6 ) smaller than for the Lambda particle. It is concluded that strong Sigma(0 )p final state interactions, and in particular the Sigma N --> Lambda p con version reaction, are the likely cause of the depletion in the Sigma signal . This hypothesis is in line with other experimental evidence in the litera ture.