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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Hadronenstruktur und -spektroskopie

HK 30.1: Gruppenbericht

Mittwoch, 21. März 2012, 16:30–17:00, RW 1

Hadronic Molecules with Open or Hidden Heavy Flavor — •Martin Cleven¹, Feng-Kun Guo², Christoph Hanhart¹, and Ulf-G. Meißner^1,2 — ¹Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany — ²Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany

We present techniques to identify molecular states in the spectrum of hadrons. As an example we study the bottomonia states Z_b(10610) and Z_b(10650) which have recently been discovered in the Υ(5S)→π⁺π⁻h_b and Υ(5S)→π⁺π⁻Υ(nS) decays. Their masses are located very close to the BB and B^*B^* thresholds. It will be shown that the assumption that the Z_b(10610) and Z_b(10650) are BB^*+c.c. and B^*B^* bound states, respectively, with very small binding energies is consistent with the data.