Low energy exclusive e⁺e⁻ → hadrons cross sections and g − 2 of the muon

Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA

^a e-mail: bill.gary@ucr.edu

Published online: 12 April 2017

Abstract

The 3.5 standard deviation discrepancy between the standard model prediction for the muon anomalous magnetic moment g−2 and the corresponding experimental measurementis one of the most intriguing potential signals for physics beyond the standard model. The largest uncertainty in the standard model prediction for the muon g − 2 arises from uncertainties in the measured low-energy e⁺e⁻ → hadrons cross sections. New cross section results from the Babar experiment at SLAC for e⁺ e⁻ → π⁺π⁻π⁰π⁰ and for e⁺e⁻ → KKππ channels are presented that significantly reduce some of the uncertaintiesin the standard model prediction for the muon g − 2.