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28 March 2024
 
  » arxiv » nucl-th/0011027

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Low energy scattering and photoproduction of $eta$-mesons on deuterons
N. V. Shevchenko ; V. B. Belyaev ; S. A. Rakityansky ; S. A. Sofianos ; W. Sandhas ;
Date 8 Nov 2000
Subject nucl-th
AbstractPhoto-production of $eta$-mesons and their collisions with light nuclei are studied within the Alt-Grassberger-Sandhas (AGS) formalism for different parameters of $eta N$ interaction. A three-body resonance or a quasi-bound state is found close to the $eta d$ threshold. Expected manifestation of this resonant behavior of $eta d$ elastic scattering in various processes involving $eta d$-system in their final states was found in calculations of the $gamma d o eta d$ reaction in the framework of modified AGS equations. These calculations revealed peaks in the energy dependence of the total cross-section almost at the same energies as in the elastic $eta d$ scattering. Meanwhile, such peaks did not appear in the impulse approximation (i.e. when $eta d$ resonance was not taken into account). This sheds some light on the nature of the enhancement of $eta$ photo-production on deuteron observed recently in the low energy experiments.
Source arXiv, nucl-th/0011027
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