Associated strangeness production at threshold
Abstract
The associated strangeness dissociation at threshold has been studied at the COSY-11 facility measuring the hyperon - and the K+K- meson pair production. 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. The near threshold production of the charged kaon-antikaon pair is related to the discussion about the nature of the scalar states in the 1 GeV/c^2 mass range, i.e. the f0(980) and a0(980). The interpretation as a K anti-K molecule is strongly dependent on the K anti-K interaction which can be studied via the production channel. A first total cross section value on the reaction pp -> ppK+K- at an excess energy of 17 MeV i.e. below the phi production threshold was measured.
Keywords
Cite
@article{arxiv.nucl-ex/0302014,
title = {Associated strangeness production at threshold},
author = {P. Kowina and M. Wolke 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 T. Lister and P. Moskal and W. Oelert and T. Rozek and R. Santo and G. Schepers and T. Sefzick and M. Siemaszko and J. Smyrski and S. Steltenkamp and A. Strzalkowski and P. Winter and P. Wustner and W. Zipper},
journal= {arXiv preprint arXiv:nucl-ex/0302014},
year = {2009}
}
Comments
3 pages, 2 figures, Presented at Conference on Quarks and Nuclear Physics (QNP 2002), Julich, Germany, 9-14 Jun 2002