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26 April 2024

» arxiv » nucl-ex/0401020

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Energy dependence of the Lambda/Sigma0 production cross section ratio in p-p interactions
P. Kowina ; H.-H. Adam ; A. Budzanowski ; R. Czyzykiewicz ; D. Grzonka ; M. Janusz ; L. Jarczyk ; B. Kamys ; A. Khoukaz ; K. Kilian ; P. Moskal ; W. Oelert ; C. Piskor-Ignatowicz ; J. Przerwa ; T. Rozek ; R. Santo ; G. Schepers ; T. Sefzick ; M. Siemaszko ; J. Smyrski ; A. Strzalkowski ; A. Taschner ; P. Winter ; M. Wolke ; P. Wustner ; W. Zipper ;
Date:	19 Dec 2003
Subject:	nucl-ex
Affiliation:	Julich, Forschungszentrum & Jagellonian U. & Munster U. & Cracow, INP & Silesia U. & ZEL, Julich
Abstract:	Measurements of the near threshold Lambda and Sigma0 production via the pp-->pK+Lambda/Sigma0 reaction at COSY--11 have shown that the Lambda/Sigma0 cross section ratio exceeds the value at high excess energies Q>=300 MeV by an order of magnitude. For a better understanding additional data have been taken between 13 MeV and 60 MeV excess energy. Within the first 20 MeV excess energy a strong decrease of the cross section ratio is observed, with a less steep decrease in the higher excess energy range. A description of the data with a parametrisation including p-Y final state interactions suggests a much smaller p-Sigma0 FSI compared to the p-Lambda system.
Source:	arXiv, nucl-ex/0401020
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