Energy dependence of the Lambda/Sigma0 production cross section ratio in p-p interactions
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.
Keywords
Cite
@article{arxiv.nucl-ex/0401020,
title = {Energy dependence of the Lambda/Sigma0 production cross section ratio in p-p interactions},
author = {P. Kowina and H. -H. Adam and A. Budzanowski and R. Czyzykiewicz and D. Grzonka and M. Janusz and L. Jarczyk and B. Kamys and A. Khoukaz and K. Kilian and P. Moskal and W. Oelert and C. Piskor-Ignatowicz and J. Przerwa and T. Rozek and R. Santo and G. Schepers and T. Sefzick and M. Siemaszko and J. Smyrski and A. Strzalkowski and A. Taschner and P. Winter and M. Wolke and P. Wustner and W. Zipper},
journal= {arXiv preprint arXiv:nucl-ex/0401020},
year = {2009}
}
Comments
6 pages, 3 figures, Presented at X. International Conference On Hadron Spectroscopy (Hadron 2003), Aschaffenburg, Germany, 31 Aug - 6 Sep 2003