Muon g-2: new physics or Standard Model confirmation?

Wednesday 29 Nov 2023, 16:00 → 17:00 Europe/London

Alex Keshavarzi (Manchester University)

The recent combined result from Run 2 and Run 3 of the Muon g-2 Experiment at Fermilab confirms both the Run-1 Fermilab and Brookhaven measurements with an overall unprecedented precision of 190 parts-per-billion. The status of the Standard Model (SM) prediction, also at sub-percent precision, rests on the determination of the hadronic vacuum polarisation (HVP) contributions. Tensions exist between data-driven dispersive evaluations and lattice QCD of the HVP. The former favours a signal of new physics at > 5 sigma when comparing the SM prediction to the Muon g-2 Experiment; the latter is in closer agreement with the experimental measurement. I will review both the status of the Muon g-2 Experiment (including projections for the release of its final result from its entire data set) and of the theoretical SM predictions, highlighting the efforts to resolve and understand current discrepancies.

16:00 → 17:00 Seminar

Speakers: Alex Keshavarzi (University of Manchester), Alex Keshavarzi (University of Manchester)

AKeshavarzi_Bristol_29-11-23.pdf