Search

We reported the observation of Y(2175) in f0(980) mass spectrum in J/ψ → ηf0(980) with f0(980) → π+π− and the observation of a broad 1−− resonance of K+K− mass in J/ψ → K+K−π0. The results from the partial wave analyses of J/ψ → γπ+π− and γπ0π0, as well as J/ψ → πK− are also presented.

The J/ψ radiative decays are suggested as promising modes for glueball search. A full Monte Carlo simulation of J/ψ→γηη and γηη', based on the design of BESIII detector, is performed to study the sensitivity of searching for a possible tensor glueball at BESIII.

Based on real data, a new parameterized model of the Main Drift Chamber response is proposed. In this model, we tune the ratio of good hits and the residual distribution separately. The difference between simulation and data in track reconstruction efficiency reduces from 1% to 0.5%, and the momentum resolution agreement improves significantly., Comment: this paper has been accepted by Chinese Physics C

By using the color confinement potential which includes the color screening effect, we studied the baryon spectra and the nucleon-nucleon interaction. The results show that the color screening effect not only improves the baryon spectrum calculation, but also can solve the long-tail problem of the color Van der Waals force. A part of the medium attraction of the nuclear force can be obtained from the color Van der Waals force.

With a 15M J/psi inclusive Monte Carlo sample, the absolute branching fraction of J/psi -> gamma eta' from the J/psi inclusive photon spectrum is measured to be Br(J/psi -> gamma eta')= (4.68 +/- 0.08 +/- 0.27) x 10(-3), which is in good agreement with the input value. The J/psi -> gamma fJ(2220) is also searched for using the same sample. Under our assumptions, the statistical significances of J/psi -> gamma fJ(2220) are larger than 7 sigma.