Results based on 106 M $psi$ events and about 226 M $J/psi$ events acquired with the BESIII detector at BEPCII are reported, including a confirmation of the BESII $pbar{p}$ threshold enhancement in $J/psi to gamma pbar{p}$, branching ratios for $chi_
{cJ} to pi^0 pi^0$ and $eta eta$, and first measurements of the branching ratios for $psi to pi^0 h_c$ and $h_c to gamma eta_c$, as well as measurements of the mass and width of the $h_c$. Also reported are first observations of the two photon process $psi to gamma gamma J/psi$ and $f_0(980) - a_0(980)$ mixing.
During the last few years there has been a renaissance in charm and charmonium spectroscopy with higher precision measurements at the $psi^{}$ and $psi(3770)$ coming from BESII and CLEOc and many new discoveries coming from B-factories. In this paper
, I review some new results on classical charmonium and $e^+ e^- to$ hadrons using B-factory Initial State Radiation and two photon events.
A Time of Flight monitoring system has been developed for BES3. The light source is a 442-443 nm laser diode, which is stable and provides a pulse width as narrow as 50 ps and a peak power as large as 2.6 W. Two optical-fiber bundles with a total o
f 512 optical fibers, including spares, are used to distribute the light pulses to the Time of Flight counters. The design, operation, and performance of the system are described.
Using 58 million $J/psi$ and 14 million $psi(2S)$ events collected by the BESII detector at the BEPC, branching fractions or upper limits for the decays $J/psi$ and $psi(2S) to Lambda bar{Lambda} pi^0$ and $Lambda bar{Lambda} eta$ are measured, and t
he decays of $J/psi$ and $psi(2S)$ to $n K^0_S bar{Lambda}+c.c.$ are observed and measured for the first time. Finally, $R$ measurement data taken with the BESII detector at center-of-mass energies between 3.7 and 5.0 GeV are fitted to determine resonance parameters of the high mass charmonium states, $psi(3770)$, $psi(4040)$, $psi(4160)$, and $psi(4415)$. The Beijing Electron Collider is being upgraded to a two-ring collider (BEPCII) with a design luminosity of $1 times 10^{33}$cm$^{-2}$ s$^{-1}$ at 3.89 GeV and will operate between 2 and 4.2 GeV in the center of mass. With this luminosity, the new BESIII detector will beable to collect, for example, 10 billion $J/psi$ events in one year of running. BEPCII and BESIII are currently nearing completion, and commissioning of both is expected to begin in mid-2008.
