Anomalies and Precision in the Belle II Era

A hybrid workshop organized by the Institute of High Energy Physics of the Academy of Sciences and brought together experimental and theoretical physicists has taken place in Mauerbach and remotely to discuss the progress of the field. The workshop, titled "Anomalies and Precision in the Belle II Era" was mostly dedicated to the emerging anomalies and tensions in the experimental tests of the standard model and in their possible interpretations.

Image: copyright HEPHY

The Belle II experiment, in fact, is perfectly suited to not only perform independent checks of the reported anomalies in B mesons decays, but it can also bring a new set of complementary tests that can lead to the discovery of new physics. Some 80 scientists participated in person remotely in September 6-8, 2021, with a total of 40 presentations being delivered. Sessions were organized to cover all anomalies reported (such as those in semileptonic B decays or in the g-2 of the muon ) and to discuss what can be done more to make sure that no stone is left unturned, especially considering the demonstrated capabilities of the Belle II experiment, where HEPHY researchers have leadership roles, to reconstruct events with a large amount of missing energy. Missing energy is also a feature of many studies involving tau leptons or searches for dark sector particles, which might be linked to or be responsible of the other anomalies. The possibility to discover forbidden processes in tau decays or low mass dark matter at Belle II was discussed in deep detail.