Speaker
Description
The Fermilab measurement of the anomalous magnetic moment of the muon $a_\mu$ at 127ppb is one of the most precise experimental tests of the Standard Model. However, the ultimate interpretation of this result is still unclear due to significant tensions in the theoretical predictions, particularly those of the hadronic vacuum polarisation (HVP) contributions $a_\mu^\text{HVP}$. The two methods $-$ lattice and dispersive $-$ give potentially discrepant results and the data inputs to the dispersive calculation are also themselves in $\sim5\sigma$ tension. I will discuss the methods used for evaluation of $a_\mu^\text{HVP}$ and the challenges presently faced, along with an update on my ongoing work on the KNTW group's dispersive prediction. Such work is necessary to match the Fermilab experimental precision and to confidently assess the case for new physics in lepton magnetic dipole moments.
