The hadronic vacuum polarization contribution to $(g_\mu-2)$: Lattice QCD+QED calculations

Understand

The anomalous magnetic moment of the muon $a_\mu$ is one of the most accurate quantities in Particle Physics.

• The long-standing discrepancy of about $3.7$ standard deviations between the experimental value and the prediction of the Standard Model could represent an intriguing indication of New Physics.
• The experiments at Fermilab (E989) and at J-PARC (E34) aim at reducing significantly the experimental uncertainty, thus making the theoretical one due to hadronic corrections the main limitation of this stringent test of the Standard Model.
• In this contribution we present the results of a first-principles lattice calculation of the hadronic vacuum polarization (HVP) contribution to $a_\mu$, including electromagnetic and $SU(2)$-breaking corrections.