QCD and Hadronic Interactions with Initial-State-Radiation at B-Factories

TL;DR

This paper discusses how recent initial-state radiation measurements at B-factories enhance the precision of hadronic cross sections, thereby improving the theoretical prediction of the muon's anomalous magnetic moment and reducing uncertainty.

Contribution

It introduces recent experimental measurements of hadron production via initial-state radiation that refine the hadronic contribution to a_mu prediction.

Findings

Improved precision in hadron cross section measurements.

Reduced uncertainty in the theoretical prediction of a_mu.

Enhanced understanding of hadronic effects in muon magnetic moment calculations.

Abstract

The efforts to improve on the precision of the measurement and theoretical prediction of the anomalous magnetic moment of the muon a_mu have turned into a test of our understanding of the hadronic contribution to vacuum polarisation. I describe how recent measurements of hadron production in e+e- interactions with initial-state radiation provide precision measurements of the hadron cross section, and have improved on the contribution to the prediction of the value of a_mu that dominates the global uncertainty.