Speaker
Sasa Prelovsek
Description
Belle experiment discovered two tetraquark candidates $Z_b^+$ with flavor structure $\bar bb\bar du$ near $B\bar B^*$ threshold. Lattice QCD study of this system will be presented. Significant attraction is found between $B$-meson and $\bar B^*$-meson at small distances. This attraction leads to an exotic virtual bound state slightly below threshold and a narrow peak in the $B\bar B^*$ rate slightly above threshold. These features resemble $Z_b^+$ seen experiment. I'll also review further theoretical work that is needed to overcome certain simplifying approximations of this study.
Author
Co-author
Huseyin Bahtiyar
(Istanbul Technical University (TR))
