Speaker
Description
Line shapes of the Zb(10610) and Zb(10650) bottomonium-like exotic states produced in the decays of vector bottomonium Upsilon(10860) are analysed. A combined analysis of the existing experimental data in the elastic and inelastic decay channels of Upsilon(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 for the data. The heavy quark spin symmetry is employed then to predict the poles position and the line shapes of the spin partners of the Zb states which are expected to be produced in radiative decays of the vector bottomonia Upsilon(10860) and Upsilon(11020).
