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arXiv 1505.04833hep-ph
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纯MS-bar方案中双环阶Z玻色子极质量

Z boson pole mass at two-loop order in the pure MS-bar scheme

Stephen P. Martin

摘要:

在标准模型中,用纯MS-棒重整化方法得到了Z玻色子在两圈全阶下的复极平方质量。输入参数是运行规范耦合,顶夸克汤川耦合,希格斯自耦合,和真空期望值,最大限度地减少朗道规范有效势。计算了非零Goldstone玻色子质量的影响。在一个合理的重整化尺度选择范围内,尺度依赖性的计算极点质量被发现是目前的实验不确定性相媲美,但真正的理论误差可能是有点大。

英文摘要:

I obtain the complex pole squared mass of the Z boson at full two-loop order in the Standard Model in the pure MS-bar renormalization scheme. The input parameters are the running gauge couplings, the top-quark Yukawa coupling, the Higgs self-coupling, and the vacuum expectation value that minimizes the Landau gauge effective potential. The effects of non-zero Goldstone boson mass are resummed. Within a reasonable range of renormalization scale choices, the scale dependence of the computed pole mass is found to be comparable to the current experimental uncertainty, but the true theoretical error is likely somewhat larger.

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