Recent Results from BESIII

Abstract

BESIII is a new state-of-the-art 4$\pi$ 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 $\psi(3770)$ decays, as well as $\tau$ 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, $\tau$ mass measurement and $R$ measurement. Results summarized in this report include observations of a subthreshold $p\bar{p}$ resonance in $\jp\to\gamma p\bar{p}$, a large isospin-violation in $\eta(1405)\rt\piz\fzero$ decays, a near-threshold enhancement in $\jpsi\rt\gamma\omega\phi$, and a M1 transition $\psip\rt\gamma\eta_c(2S)$; the $\rho\pi$ 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 $\tau$ mass measurement.