caa a22 4500 445872667 CHVBK 20180317145517.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1140/epja/i2011-11120-6 doi (NATIONALLICENCE)springer-10.1140/epja/i2011-11120-6 Bound state nature of the exotic Zb states [Elektronische Daten] [M. Cleven, F. Guo, C. Hanhart, U. Meißner] The assumption that the newly observed charged bottomonia states Z b(10610) and Z b(10650) are of molecular nature is confronted with the measured invariant-mass distributions for the transitions of the ϒ(5S) to the final states h b π + π − and h b(2P)π + π −. It is shown that the assumption that the Z b(10610) and Z b(10650) are B $$\bar B*$$ + c.c. and B * $$\bar B*$$ bound states, respectively, with very small binding energies is consistent with the data. The calculation is based on a power counting for bottom meson loops, which is explicitly given up to two-loop in the framework of a nonrelativistic effective-field theory. We also show that if the Zb states are of molecular nature, then the data should not be analyzed by using a Breit-Wigner parametrization. SIF, Springer-Verlag Berlin Heidelberg, 2011 Cleven M. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany aut Guo F. Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany aut Hanhart C. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany aut Meißner U. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany aut The European Physical Journal A Springer-Verlag 47/10(2011-10-01), 1-8 1434-6001 47:10<1 2011 47 10050 https://doi.org/10.1140/epja/i2011-11120-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epja/i2011-11120-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cleven M. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany aut NATIONALLICENCE 700 1- Guo F. Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany aut NATIONALLICENCE 700 1- Hanhart C. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany aut NATIONALLICENCE 700 1- Meißner U. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany aut NATIONALLICENCE 773 0- The European Physical Journal A Springer-Verlag 47/10(2011-10-01), 1-8 1434-6001 47:10<1 2011 47 10050 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer