Abstract
Line shapes of the Zb(10610) and Zb(10650) bottomonium-like exotic states produced in the decays of the vector bottomonium ϒ(10860) are analysed. A combined analysis of the existing experimental data in the elastic and inelastic decay channels of the ϒ(10860) is performed within a nonperturbative coupled-channel approach which complies with the requirements of unitarity and analyticity of the multichannel amplitude. The nature of the Zb states is revealed and the parameters of the interaction are extracted from the fit to the data.
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