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arXiv 1002.1071hep-ph
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具有最小味破坏的标准模型的双Higgs二重态扩展中的QCD修正

QCD Corrections in two-Higgs-doublet extensions of the Standard Model with Minimal Flavor Violation

G. Degrassi, P. Slavich

摘要:

在满足最小味破坏准则的情况下,我们给出了对R_b和Delta B=1有效哈密顿量的QCD修正,即在SU(3)xSU(2)xU(1)的(1,2)_1/2或(8,2)_1/2表示中加入第二个Higgs场。在引入QCD修正后,R_b的预测变得对顶质量重整化方案的选择几乎不敏感,对于I型和II型模型,这意味着tan(beta)的下限更稳健。用QCD修正的Rb和BR(B → Xs γ)的测定结果讨论了(有色)带电希格斯玻色子玻色子与顶夸克和底夸克耦合的约束条件.

英文摘要:

We present the QCD corrections to R_b and to the Delta B=1 effective Hamiltonian in models with a second Higgs field that couples to the quarks respecting the criterion of Minimal Flavor Violation, thus belonging either to the (1,2)_1/2 or to the (8,2)_1/2 representation of SU(3)xSU(2)xU(1). After the inclusion of the QCD corrections, the prediction for R_b becomes practically insensitive to the choice of renormalization scheme for the top mass, which for the type-I and type-II models translates in a more robust lower bound on tan(beta). The QCD-corrected determinations of Rb and BR(B->Xs gamma) are used to discuss the constraints on the couplings of a (colored) charged Higgs boson to top and bottom quarks.

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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