Muon g-2 and Hadronic Vacuum Polarization: Recent Developments

Abstract

Abstract. We discuss various experiments on e + e − annihilation into hadrons relevant to the problem of the muon anomalous magnetic moment. They include a status of the ISR measurements of the e + e − → π + π − as well as studies of numerous hadronic final states in experiments with the CMD-3 and SND detectors at the VEPP-2000 e + e − collider.

The Fermilab g-2 experiment

“…[28][29][30][31]  Hadronic uncertainties due to photons coupling to the vacuum. [32][33][34][35][36][37][38][39][40] These corrections and their associated uncertainties are shown graphically in Error! Reference source not found.…”

Theory review of the muong− 2

“…Moreover, these uncertainties become quite substantial when compared to the expected precision of the FNAL experiment, which suggests that further effort is required to improve the measurements of the e + e − → hadrons annihilation cross sections at low energies. It is re-assuring that the corresponding program of measurements exists both at BEPC and at Novosibirsk, so that substantial improvements in our understanding of a hvp μ can be expected on a few years time scale [16,17].…”