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27 April 2024

» arxiv » nucl-ex/0302014

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Associated strangeness production at threshold
P. Kowina ; M. Wolke ; H.-H. Adam ; A. Budzanowski ; R. Czyzykiewicz ; D. Grzonka ; M. Janusz ; L. Jarczyk ; B. Kamys ; A. Khoukaz ; K. Kilian ; T. Lister ; P. Moskal ; W. Oelert ; T. Rozek ; R. Santo ; G. Schepers ; T. Sefzick ; M. Siemaszko ; J. Smyrski ; S. Steltenkamp ; A. Strzalkowski ; P. Winter ; P. Wustner ; W. Zipper ;
Date:	13 Feb 2003
Journal:	Eur.Phys.J. A18 (2003) 351-354 DOI: 10.1140/epja/i2002-10234-2
Subject:	nucl-ex
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.
Source:	arXiv, nucl-ex/0302014
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