【摘要】 工作在北京正负电子对撞机(BEPC)上的北京谱仪(BES)对2—5GeV能区的R值进行了精确测量,这一成果对寻找新物理和新粒子Higgs在国际高能物理界带来巨大冲击,本文对R值测量及相关物理,如μ子反常磁矩α_μ,QED耦合常数α(M_z~2),μ子偶素的基态超精细劈裂(HFS)以及确定强耦合常数α_s和重夸克质量等的最新进展和未来展望在实验和理论两方面均作了较详尽的介绍。更多还原

【Abstract】 New measurements of R value in the energy range of 2-5GeV were completed by Beijing Spectrometer Collaboration (BES) at Beijing Electron Positron Collider (BEPC) and caused a strong impact on the search for new physics and Higgs particle in the international high energy physics community. The newest progress and future prospect for the experimental measurement of R value and some relative physics, such as the anomalous magnetic moment of muon αμ , the running QED coupling constant a ( Mz2 ) , the muonium hyperfine splitting ( HFS) VHFS , and the determination of strong coupling constant αs and heavy quark masses, in both experimental and theoretical aspects, were introduced.更多还原