Speaker
Roman Mizuk
Description
Bottomonia are heavy mesons consisting of b and b-bar quarks, while bottomonium-like states are mesons containing b and b-bar quarks but having properties unexpected for bottomonia. Presumably they have a more complicated structure with excited gluon fields (glueballs) or additional valence light quarks (multiquark states: hadronic molecules or compact tetrquarks). Candidates for such exotic states have been observed a few years ago by the Belle experiment at the KEKB e+e- collider (Japan). We present status and recent results in the field, that include observation of several new hadronic transitions, measurement of the eta_b(1S) mass using radiative transition from Upsilon(2S) and scan of several exclusive cross sections.
