Recent Results from BES3

Abstract

The BEPCII collider operates in the tau-charm center of mass energy region from 2 GeV to 4.6 GeV with a design luminosity of 1 × 10 33 cm −2 s −1 . Samples of 106 M ψ events and 225 M J/ψ events were recorded by the BESIII detector in the summer of 2009. Results based on these samples are described, including h c studies, measurements of χ cJ decays, confirmations of the BESII X(1660) and X(1835) resonances, f 0 (980) − a 0 (980) mixing signals, and ψ → γP(P = π 0 , η, η ) . Also described are the BESIII beam energy measurement system, which will be important for an improved tau mass measurement, and the future BESIII program.