EPJ Web Conf.
Volume 218, 2019The 11th International Workshop on e+e− Collisions from Phi to Psi (PhiPsi 2017)
|Number of page(s)||6|
|Section||Hadron Spectroscopy and Meson Decays|
|Published online||18 October 2019|
Heavy-quark spin-symmetry partners of Zb(10610) and Zb(10650) molecules
Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany
2 Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia
3 Forschungszentrum Jülich, Institute for Advance Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, D-52425 Jülich, Germany
4 National Research Nuclear University MEPhI, 115409, Kashirskoe highway 31, Moscow, Russia
5 Moscow Institute of Physics and Technology, 141700, Institutsky lane 9, Dolgoprudny, Moscow Region, Russia
Published online: 18 October 2019
Heavy-quark spin-symmetry (HQSS) partners of the isovector bottomonium like states Zb(10610) and Zb(10650) are predicted within the molecular picture. Treating both Zb’s as shallow bound states, we solve the system of coupled-channel integral equations for the contact plus one-pion exchange (OPE) potentials to predict the location of the partner states with the quantum numbers J++ (J = 0,1,2). In particular, we predict the existence of a narrow tensor 2++ state residing a few MeV below the B∗ B¯∗ threshold. It is emphasised that the tensor part of the OPE potential in combination with HQSS breaking due to the nonvanishing B∗ -B mass splitting has a significant impact on the location of this partner state.
© The Authors, published by EDP Sciences, 2019
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