Speaker
Mr
Christian Hambrock
(DESY)
Description
In the past several years, experiments at the two B-factories, BaBar and Belle, and at the Tevatron collider, CDF and D0, have discovered an impressive number of new hadronic states in the mass region of the charmonia labeled as $X$, $Y$ and $Z$, which, however, defy a conventional $c\bar{c}$ charmonium interpretation. Different frameworks have been suggested to describe the observed states, among which the tetraquark model is a promising candidate. According to Heavy Quark symmetry the puzzling states should find their counterpart in the $b\bar{b}$ sector. This talk provides an overview of the calculation of doubly bottom tetraquark masses, discusses their evidence in the $R_b$-scan performed by BaBar and presents a tetraquark interpretation of the anomalous Belle data found near the $\Upsilon(5S)$ resonance.
Primary author
Mr
Christian Hambrock
(DESY)
