BESIII Data Quality Validation And X_cJ Two Body Decay Analysis

BEPCII is the only one electron-positron collider working atτ-charm energy region in the world and BESIII is a conventional magnet detector which will run in the BEPCII. the designed luminosity will achieve 1.0*1033cm-2s-1 atψ(2S) peak. With the large data sample taking at the BESIII, we can carry out the study of charmonium, charm-meson,τand R value.The first part of this paper introduces the Data Quality Validation (DQV). People have preliminarily planed to collect data sample at BESIII around July this year. The reliability of physics analysis results will sharply depend on the data quality. Therefore, it is necessary for us to do DQV before we do physics analysis. DQV is to check the performance of detector, online and offline system by selecting control samples with high statistics and purity. The control sample involved in this paper are BhaBha, dimuon, inclusive hadrons, J/ψ→KsKπ,ψ(2S)→γγJ/ψand inclusiveγenergy spectrum inψ(2S) decay.The second part of this paper introduces the study ofχcJ decays to pseudoscalar-meson, vector-meson and baryon pair. The first two decay modes are helpful to clarify the role played by the OZI-rule violations and disentangle the correlations from different mechanisms in the charmonium decays into light inclusive hadrons. The last decay mode is used to test the color-octet state theory. Some final states of these three decay modes have been observed by BESII and CLEO-c, but most of their measured precisions are to low to test theoretical model. A largerψ(2S) data sample is essential. We hope that our study onχcJ two-body decay based on MC sample can help people to determine the data-taking plan in the BESIII.