Department of Physics

Abstract: In recent years, a large number of exotic hadron candidates have been discovered in the charmonium and bottomonium regions. Electron positron annihilation in experiments like BaBar, BESIII, Belle(II) and CLEO has played an important role in the discoveries of many of these charmonium- and bottomonium-like states, in particular of vector-states sharing the quantum numbers with the photon. Thus far, new resonances and their properties like masses and decay widths have regularly been studied using fits of simplified models to the cross sections of e+e- annihilation to exclusive final states, leading to large model dependencies. Here, I will present the first global analysis of e+ e- annihilation data in the bottomonium region, confirming the existence of a new state Y(10750) recently claimed by Belle and extracting branching fractions and electronic widths that can deviate significantly from older results.