EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 9, 143-146

Low-energy $\mathsf\eta$d-resonance

N.V. Shevchenko1,3 - V.B. Belyaev1,2 - S.A. Rakityansky2 - S.A. Sofianos2 - W. Sandhas4

1 Joint Institute for Nuclear Research, Dubna, 141980, Russia
2 Physics Department, University of South Africa, P.O. Box 392, Pretoria 0003, South Africa
3 Physics Department, Irkutsk State University, Irkutsk 664003, Russia
4 Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany

Received: 12 June 2000
Communicated by W. Weise

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 $a_{\eta N}$. The position of the resonance moves towards the $\eta d$ threshold when ${\rm Re\,}a_{\eta N}$ is increased, and turns into a quasi-bound state at ${\rm Re\,}a_{\eta N}\sim$ 0.7-0.8fm

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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