BESIII上单举和半单举强子事例的研究

强子事例末态是BESIII上tau-粲能区物理过程的主要衰变形式，绝大部分物理过程都伴随着强子事例的产生。根据其衰变末态的具体特征可分为单举、半单举和遍举几类。单举强子事例不必重建具体的衰变过程，可用于测量R值和确定J/psi和psi'事例数。遍举强子事例要求重建一个具体的衰变道，用于某些绝对分支比的测量和研究某些共振态粒子或某些结构。半单举强子事例是介于单举和遍举之间的一种事例类型，只重建部分共振态，也可用于各种分支比，物理参数的测量等。本研究将利用单举强子事例致力于开展R值和psi'总数的测量。同时开展若干重子、介子衰变道和粲阈以上的遍举粲介子衰变截面的研究，比如eta_c，J/psi,psi'到重子对的衰变。 e+e- ->DD截面测量等，这些衰变模式有些从前的测量精度要么非常低，要么从未被测量。

The hadronic events is the dominant final state of tau-charm energy region at BESIII. The inclusive hadronic events contain all hadronic events, don't aim at a certain process. Tt can be used to measure R value, and determine the total number of J/psi, psi'. The exclusive hadron events aim at a certain process.It can be used to measure the branching fraction, or study some resonances，or structures. The semi-inclusive hadronic events just reconstructed part of hadronic resonances, it can also be used to measure branching fraction, some physics parameters and so on. This study will focus on the measurement of R value, the determination of the total number of J/psi, psi'. Meanwhile, we also study the decay of some baryon, meson final state and measure the cross section of the exclusive charm meson . For example, J/psi,psi' decay to baryon pair， the measurement of cross section of e+e- ->DD. These decay modes either have the poor measurement precisions, or remain unknown.