Low-energy eta-d resonance

Abstract

Elastic eta-d scattering is considered within the Alt-Grassberger-Sandhas (AGS) formalism for various eta-N input data. A three-body resonant state is found close to the eta-d threshold. This resonance is sustained for different choices of the two-body eta-N scattering length a_{ηN}. The position of the resonance moves towards the eta-d threshold when Re a_{ηN} is increased, and turns into a quasi-bound state at Re a_{ηN}=0.733 fm.

13 pages, LaTeX (revtex.sty), 5 figures (epsfig), submitted to Phys.Rev.Lett

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