Non-universal Gauge Bosons Z′ and the Process e^＋e^- → f f^-

We discuss the observability of the non-universal bosons Z′ predicted by topcolor-assisted technicolor(TC2) models in the near future high-energy linear e^+e^- collider (LC) experiments via studying its contributions to the processes e^+e^- → bb^- and ττ^-. We find that the signals of the new particle Z′ can be detected by measuring the relative corrections to the cross sections and the ratio of signal over square root of the background S/√B for these two processes in the LC experiments. In most of the parameter space of TC2 models, it is difficult to observe the virtual effects of the Z′ exchange on the forward-backward asymmetries AFB (bb^-) and AFB (ττ^-).

高能核物理实验国际合作研究近期代表性成果

高能核物理实验的主要物理目标是在极端高温度和能量密度条件下研究核物质新形态-夸克-胶子等离子体的产生及演化特性。深入揭示当前物质世界的深层次结构,以及强核力相互作用在高温、高密多粒子体系中的行为、特性。探寻在此极端条件下的新物理现象。本工作概述我国所参与的主要高能核物理实验国际合作研究项目及其物理目标。介绍我国在国际合作研究中所做出的近期代表性成果,以及我国在该领域研究中的新物理探究方面所取得的典型成就。并对高能核物理下一步的研究发展方向做出展望。