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arXiv 1005.2625hep-ph
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顶夸克在QCD中NNLO衰变的W玻色子的螺旋度分数

Helicity fractions of W bosons from top quark decays at NNLO in QCD

Andrzej Czarnecki, Jurgen G. Korner, Jan H. Piclum

摘要:

在强耦合常数α s下,计算了非极化顶夸克衰变为纵向和横向极化W玻色子的二阶衰变率.在考虑有限底夸克质量和电弱效应的情况下,W玻色子螺旋度分数的标准模型预测值分别为:F_L=0.687(5),F_+=0.0017(1),F_-=0.311(5).

英文摘要:

Decay rates of unpolarized top quarks into longitudinally and transversally polarized W bosons are calculated to second order in the strong coupling constant alpha_s. Including the finite bottom quark mass and electroweak effects, the Standard Model predictions for the W boson helicity fractions are F_L=0.687(5), F_+=0.0017(1), and F_-=0.311(5).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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