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arXiv 1502.04719hep-ph
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重夸克在四圈上的退耦和有效的Higgs-费米子耦合

Decoupling of heavy quarks at four loops and effective Higgs-fermion coupling

Tao Liu, Matthias Steinhauser

摘要:

我们计算了有效$n_l$ -味QCD和$(n_l+1)$-味QCD的轻夸克质量与四圈阶数之间的退耦常数$ζ_m$。直接的应用是在顶夸克的尺度上甚至在大统一理论尺度上评估具有五种活性味的$\overline{\rm MS}$粲夸克质量和底夸克质量。借助于低能定理,$ζ_m$可以获得希格斯玻色子玻色子与轻夸克的有效耦合,并具有五圈精度.我们简要讨论了对$Γ(H\to b\bar{b})$的影响。

英文摘要:

We compute the decoupling constant $ζ_m$ relating light quark masses of effective $n_l$-flavour QCD to $(n_l+1)$-flavour QCD to four-loop order. Immediate applications are the evaluation of the $\overline{\rm MS}$ charm quark mass with five active flavours and the bottom quark mass at the scale of the top quark or even at GUT scales. With the help of a low-energy theorem $ζ_m$ can be used to obtain the effective coupling of a Higgs boson to light quarks with five-loop accuracy. We briefly discuss the influence on $Γ(H\to b\bar{b})$.

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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