Overview of bottomonium spectroscopy and prospects for the Belle2 experiment
Bottomonium physics has been a major success for the first generation of B-factories. Among the main achievements obtained, there are the discovery of several bottomonium states, such as etab(1S) and hb(1P,2P), and the observation of exotic resonances, namely Zb(10610) and Zb(10650). Moreover, important informations on bottomonium are given not only by new resonances, but also by the study of the transitions occurring between its states. In particular, the study of hadronic transitions among bottomonia, and their relative magnitude, can be used as a test bench for non-perturbative approaches to QCD. For instance, transitions through an eta meson, despite involving a heavy quark spin-symmetry violation, have been measured to have an unexpectedly enhanced branching fraction with respect to those through a dipion system. We summarise the heritage left to this field by the first generation of B-factories, enlightening also the open issues that are expected to be more extensively understood with the data collected by the Belle2 experiment.
Monday, 12 June 2017, ore 14:30 — Sala Wataghin