Hadronic effects in (g-2)_mu and alpha_QED (M_Z): Status and perspectives

TL;DR

This paper reviews recent evaluations of hadronic contributions to the muon g-2 and alpha(M_Z), presenting a new estimate for the hadronic shift and discussing future improvements from experimental facilities.

Contribution

It provides a new precise estimate of the hadronic shift delta_alpha hadronic using recent perturbative calculations and discusses future prospects for reducing uncertainties in g-2 evaluations.

Findings

New estimate for delta_alpha hadronic: 0.027782 +/- 0.000254

Implied 1/alpha(M_Z): 128.913 +/- 0.035

Potential improvements from DAPHNE at Frascati

Abstract

I review recent evaluations of the hadronic contributions to the muon anomalous magnetic moment (g-2)_mu and to the effective fine structure constant alpha (M_Z). A new estimate for the hadronic shift delta_alpha hadronic = 0.027782 +/- 0.000254 is presented which implies 1/alpha (M_Z) = 128.913 +/- 0.035. It is based on a recent perturbative calculation of the Adler function which includes mass effects up to three-loops in a MOM scheme and requires little ad hoc assumptions. I then discuss perspectives for possible improvements in estimations of g-2 which we expect from the Phi--factory DAPHNE at Frascati.