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19 March 2024
 
  » arxiv » arxiv.0707.1489

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Is there an eta-3He quasi--bound state ?
C. Wilkin ; M. Buescher ; D. Chiladze ; S. Dymov ; C. Hanhart ; M. Hartmann ; V. Hejny ; A. Kacharava ; I. Keshelashvili ; A. Khoukaz ; Y. Maeda ; T. Mersmann ; M. Mielke ; S. Mikirtychiants ; M. Papenbrock ; F. Rathmann ; T. Rausmann ; R. Schleichert ; H. Stroeher ; A. Taeschner ; Yu. Valdau ; A. Wronska ;
Date 10 Jul 2007
AbstractThe observed variation of the total cross section for the dp -> 3He eta reaction near threshold means that the magnitude of the s--wave amplitude falls very rapidly with the eta centre--of--mass momentum. It is shown here that recent measurements of the momentum dependence of the angular distribution imply a strong variation also in the phase of this amplitude. Such a behaviour is that expected from a quasi--bound or virtual eta-3He state. The interpretation can be investigated further through measurements of the deuteron or proton analysing powers and/or spin--correlations.
Source arXiv, arxiv.0707.1489
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