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Open strangeness threshold production at COSY-11

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arxiv hep-ex/0411064 v1 pith:XUMVZ5QM submitted 2004-11-20 hep-ex

Open strangeness threshold production at COSY-11

classification hep-ex
keywords productionchannelsreactionstrangenesscosy-11differenthyperonopen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The open strangeness production near threshold is investigated at the internal experiment COSY-11 in different reaction channels. Recently, the main focus has been to extend measurements of the hyperon production pp->pK+Lambda/Sigma0 in different isospin channels as well as the associated strangeness production in pp->ppK+K-. The experimental technique is based on the reconstruction of the four momentum for all positively charged ejectiles. Neutrons are detected in addition using a neutral particle detector. The unregistered hyperon or meson is identified by means of the missing mass technique. The present status of the analysis for both reaction channels is presented. In case of the reaction pp->ppK+K-, very preliminary cross sections are shown.

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