Speaker
Description
The unprecedented precision expected at the FCC-ee offers unique chances to unveil sought-for New Physics signals. However these "BSM searches" will be very different from current searches at LHC, since signals will appear as subtle deviations between ultra-precise data and theory predictions. A blind applications of the global SMEFT fit is unlikely to be able to resolve these signals due to the large dimensionality of its parameter space. In this contribution we study under which conditions the SMEFT framework at the FCC-ee can identify (and not merely constrain/exclude) BSM signals, taking specific UV completions as a case study. A crucial ingredient is the "BSM closure test", where synthetic data corresponding to different UV completions over a wide parameter space is generated (and reproduced by the fit). We also discuss how very low-energy measurements, in particular Beta decays, can be best deployed to complement this exciting program of BSM searches at the FCC-ee.