Speaker
Prof.
Qian Wang
(South China Normal University)
Description
In the last decade, numerous states have been observed which contain a heavy quark-antiquark pair, but demonstrate properties at odds with a simple quarkonium assignement. Such states are conventionally denoted as exotic states and traditionally labelled by the letters X, Y and Z.
Due to the presence of the heavy quraks, properties of various exotic states can be related through the Heavy Quark Spin Symmetry (HQSS). We build an Effective Field Theory approach to exotic molecular states in the spectrum of bottomonium which respects HQSS and fix all the parameters directly from the existing experimental data for the Zb(10610) and Zb(10650) resonances. Then the properties, such as the line shapes and the poles position, of their spin partners WbJ (J^PC=J^++, J=0,1,2) are predicted in a parameter-free way.
Primary author
Prof.
Qian Wang
(South China Normal University)
