△r的实验测量与唯象分析

Experimental Determination of the Radiative Correction Factor △r and Phenomenological Analyses

本文根据LEP和CDF等实验组的最新实验结果,导出了辐射修正因子△r的实验值,并把该结果和根据标准模型理论计算得到的△r理论值进行了比较.本文计算了全单圈和主要双圈图的贡献,根据几率分布得到了对M_t比较严格的上限限制;当取Higgs粒子质量M_H=100GeV时,M_1<175GeV(95％C.L.).本文还分析计算了其它实验误差和理论误差对M_t的影响.

In this paper the experimental value of radiative correction △r was derived from the new data of sin^2θ_w and W boson mass M_W given by LEP, CDF and other collaborations. A careful comparison of (△r)_(exp) with the standard model expectation was carried out. We first calculated the △r at full one-loop level, and then the main two-loop contributions were included. More stringent upper bounds on M_t, were obtained from the analysis of probability distribution: M_1<175GeV at 95% C. L. for a given M_H=100GeV. The effects on M_t from other experimental and theoretical errors were also computed.