现实的一代ETC模型对Zb_b~－、Zτ~＋τ~－顶角的辐射修正

Radiative Corrections to the Zb_b￣- and Zτ￣+τ￣- Vertices in a Realistic One -Family Extended Technicolor Model

在一个现实的一代扩展人工色（ＥＴＣ）模型中，计算了旁路（Ｓｉｄｅｗａｙｓ）及对角（ｄｉａｇｏｎａｌ）ＥＴＣ规范玻色子交换对Ｚｂ、Ｚτ＋τ－顶角的单圈辐射修正．结果表明Ｚ→ｂ过程的衰变宽度Ｔｂ、分支比Ｒｂ以及τ的极化不对称参数Ａτ都较标准模型的要大，与最近的实验数据相符．

In a realistic effective one-family extended technicolor(ETC)model without exact custodial symmetry, we calculate the one-loop corrections to the Zb and Zτ+τ- vertices from the sideways and diagonal ETC gauge boson exchange.The results show that both the Z→ b partial Width Tb and branching ratio Rb and the τ polarization asymmetry parameter Aτ are enhanced by the corrections and are in agreement with the present experimental data.