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.


InterLeptons News & Co

Back to overview


The group joins the Belle II effort to measure P5'

If a new lepton flavor non-universal interaction exists, this might affect some specific observable quantities in B-meson decays. One possibility is the decay B->to K*ll. This decay, suppressed in the standard model, proceeds via so-called loop diagrams. A new interaction that violates the universality of lepton flavor can interfere with these loops, and such interference can be visible in the angular distribution of the decay products. The group just joined the Belle II effort in the study of B->K*ll, and we are aiming to measure the quantity P5', related to the angular distribution of the decay products in B->K*ll. P5' was measured in the past, and the results show a tension between the standard model predictions and the experimentally measured value at a level larger than 3 sigma. Welcome on board, Matthias, and good luck for this adventure!

Back to overview

Friends' Pages

Belle II Collaboration
Institute of High Energy Physics (HEPHY)
Academy of Sciences (OEAW)
European Research Council (ERC)
Austrian Science Fund (FWF)
Belle II Facebook
Jennifer 2