Low-energy hadronic cross sections measurements at BaBar, and implication for the g-2 of the muon

TL;DR

This paper reports on precise measurements of low-energy hadronic cross sections at BaBar, which improve the theoretical prediction of the muon g-2 and help address the current discrepancy between theory and experiment.

Contribution

It presents new measurements of hadronic cross sections using the full BaBar dataset, enhancing the precision of muon g-2 calculations.

Findings

Improved precision in hadronic cross section measurements.

Contributions to reducing the uncertainty in muon g-2 prediction.

Ongoing analysis of additional final states.

Abstract

The BaBar Collaboration has an intensive program studying the cross sections of hadron production in low-energy e+e- annihilation, accessible via initial-state radiation. Our measurements allow a significant improvement in the precision of the predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on the current > 3 sigma difference between the predicted and the experimental values. We have published results on a number of processes with two to six hadrons in the final state, and other final states are currently under investigation. We report here on the most recent results obtained by analysing the entire Babar dataset.