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The Alt-Grassberger-Sandhas N-body theory is used to study interaction ofeta-mesons with d, 3He, and 4He. Separable expansion of the subamplitudes isadopted to convert the integral equations into the quasi-two-body form. Theresulting formalism is applied to fit the existing data for low-energy etaproduction on few-nucleon targets. On the basis of this fitting procedure thescattering lengths a_{eta d}, a_{eta 3He}, a_{eta 4He} as well as thesubthreshold behaviour of the elementary eta-N scattering amplitude areobtained.

Systematic few-body analysis of eta-d, eta-3He and eta-4He interaction at low energies