Speaker
Vadim Baru
(Institute for Theoretical Physics, Ruhr-University Bochum)
Description
Heavy-quark spin-symmetry (HQSS) partners of the isovector bottomonium-like states $Z_b(10610)$ and $Z_b(10650)$ are predicted within the molecular picture. Treating both $Z_b$ states 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 $B^*\bar B^*$ 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 the partner states.
Primary author
Vadim Baru
(Institute for Theoretical Physics, Ruhr-University Bochum)
Co-authors
Dr
Alexey Nefediev
(Moscow Institute of Physics and Technology)
Dr
Arseniy Filin
(Institute for Theoretical Physics II, Ruhr-University Bochum)
Prof.
Christoph Hanhart
(Forschungszentrum Jülich, Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics)
Evgeny Epelbaum
(Ruhr-Universität Bochum)
