Speaker
Description
Recent experimental and theoretical developments with muon g-2 have substantially altered what we can infer about new physics from it. On the experimental side the FNAL experiment measured a g-2 value that is consistent with the older BNL measurement, while on the theory side lattice results for the HVP contributions, which have the largest uncertainty of all the contributions, have now reached a similar level of precision as the data driven predictions. The lattice results challenge the long standing deviation between the SM predictions and the measured value, while new CMD3 data has substantially increased tension between available datasets for data driven predictions. These results may indicate we are entering an era where we have robust calculations of SM muon g-2 and experimental measurements that agree and muon g-2 re-emerges as a crucial constraint on new physics. In this light I review the significance and impact of muon g-2 as a probe of new physics, showing how it can complement or out reach collider experiments depending on the new physics scenario. I will also discuss key factors that determine the size of the contributions and how muon g-2 is related to other observables.