Pushing the boundaries of knowledge
"A search for new interactions at Belle II using leptons"

This is the official page of the research team "InterLeptons" at the High Energy Physics Institute of the Austrian Academy of Sciences. The team, led by Dr. Gianluca Inguglia, is funded under the grant agreement nr. 947006 of the Starting Grant award offered by the European Research Council (ERC). The research activities of the team will be described and kept up-to-date on these pages.
The aim InterLeptons is to unveil the new physics nature of the so-called flavor anomalies implementing a bottom-up approach based on the studies of data collected at the Belle II experiment, located in the interaction region
of the Super-KEKB collider. The team focuses on final state events containing leptons and a large amount of missing energy. The results of the searches will be interpreted in terms of low mass dark matter, new forces/interactions, and in terms of lepton flavor violating and lepton flavor non-universal couplings.

InterLeptons brings a significant advancement of a new research area in Austria with the potential of revolutionizing particle physics.


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Anomalies and Precision in the Belle II Era - Workshop

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. The Belle II experiment is ideally suited to perform independent checks of the reported anomalies in B mesons decays and 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 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 to still do 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 for other anomalies. The possibility to discover forbidden processes in tau decays or low mass dark matter at Belle II was discussed in deep detail.
We think that many fruitful collaborations among participants can be foreseen in the future. As experimentalists, we get back to work and analyze our data to provide new results, and we will reconvene in 2023 to discuss them.


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