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arXiv 1310.2256hep-ph
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Z玻色子宽度和产生率的双圈费米子电弱修正

Two-loop fermionic electroweak corrections to the Z-boson width and production rate

A. Freitas

摘要:

在完整计算封闭费米子环的弱电双环修正的基础上,提出了改进的标准模型中Z玻色子衰变宽度和强子Z峰截面的预言.与以前的部分结果相比,Z宽度和强子截面的预测分别移动约0.6 MeV和0.004 nb。提供了紧凑的参数化公式,其近似的完整结果优于4 ppm。

英文摘要:

Improved predictions for the Z-boson decay width and the hadronic Z-peak cross-section within the Standard Model are presented, based on a complete calculation of electroweak two-loop corrections with closed fermion loops. Compared to previous partial results, the predictions for the Z width and hadronic cross-section shift by about 0.6 MeV and 0.004 nb, respectively. Compact parametrization formulae are provided, which approximate the full results to better than 4 ppm.

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