2012/09/21 by Huang, Guangshun
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.1209.4813
BESIII is a new state-of-the-art 4π detector at the upgraded BEPCII two-ring \ee collider at the Institute of High Energy Physics in Beijing, China. It has been in operation since 2008, and has collected the world's largest data samples of \jpsi, \psip and ψ(3770) decays, as well as τ mass scan and low energy points for R measurement. These data are being used to make a variety of interesting and unique studies of light-hadron spectroscopy, precision charmonium physics, high-statistics measurements of D meson decays, τ mass measurement and R measurement. Results summarized in this report include observations of a subthreshold pp resonance in \jp→γpp, a large isospin-violation in η(1405)\rt\piz\fzero decays, a near-threshold enhancement in \jpsi\rtγωϕ, and a M1 transition \psip\rtγηc(2S); the ρπ puzzle in \jpsi and \psip decays; some recent precision measurements of \ec and \hc lineshapes; and preliminary results of the D meson (semi-)leptonic decays and the τ mass measurement.