Flavour changing processes based on the b→sll transition are excellent probes of new physics (NP). They are strongly suppressed in the Standard Model (SM), where they appear only at the one-loop order and also depend on small CKM elements. This makes them sensitive to indirect effects of heavy new particles with masses far above the reach of direct LHC searches. Renato Quagliani and Peter Stangl will discuss the current status and prospects of the search for NP using b→sll decays, both from an experimental and a theoretical perspective. The latest experimental results from LHCb confirming lepton flavour universality in rare b→sll transitions will be discussed together with their theoretical interpretations and an experimental outlook.
Renato Quagliani is a postdoctoral researcher at the EPFL in Lausanne. He obtained his PhD from a co-tutel programme between University of Paris-Saclay and University of Bristol and held a postdoctoral position at the LPHE group at University Sorbonne before joining the EPFL in 2021. He spent a substantial part of his career in the development of pattern recognition algorithms for the Run3 data taking at the LHCb experiment before moving his interests in the data analysis of rare decays with the LHCb experiment. In particular, he focussed his studies on rare b→sll transitions and the test of lepton flavour universality in rare decays with using the LHCb experiment.
Peter Stangl is a Fellow of the CERN Theory Department, with research interests in flavour and beyond the SM (BSM) physics. He obtained his PhD from the Technical University of Munich and held postdoctoral positions at LAPTh Annecy and the University of Bern before joining CERN in 2022. He has worked in particular on the theoretical interpretation of experimental results of b→sll decays, both in the framework of effective field theory and in explicit BSM models.