Jun 26 – 29, 2017
Schloss Waldthausen
Europe/Berlin timezone

Heavy-quark spin-symmetry partners of Zb(10610) and Zb(10650) molecules

Jun 29, 2017, 2:40 PM
Schloss Waldthausen

Schloss Waldthausen

Im Wald 1<br /> 55257 Budenheim


Vadim Baru (Institute for Theoretical Physics, Ruhr-University Bochum)


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)


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)

Presentation materials