论文标题
$ {\ cal cp} $顶级Yukawa互动的结构：NLO QCD校正和脱离效果
${\cal CP}$ structure of the top-quark Yukawa interaction: NLO QCD corrections and off-shell effects
论文作者
论文摘要
自2012年在大型强子对撞机上发现了Higgs玻色子以来，可以说是标准模型粒子中最著名的，并且已经进行了许多测量以评估其性质。除其他外，其中包括对Higgs Boson的$ {\ cal cp} $状态的测量结果，该状态预计为$ {\ cal cp} $ - 甚至。即使排除了纯$ {\ cal cp} $ - 奇数状态，但$ {\ cal cp} $的混合可能尚未排除。 In this work we present predictions for the associated production of a leptonically decaying top quark pair and a stable Higgs boson $p p \to e^+ ν_e\, μ^- \barν_μ\,b\bar{b}\,H$ with possible mixing between ${\cal CP}$-even and ${\cal CP}$-odd states at NLO in QCD对于$ \ sqrt {s} = 13 $ tev的LHC。考虑到有限的顶Quark和仪表玻色子宽度效应以及所有双重，单，单和非共鸣图，包括其干扰效应。我们比较了$ {\ cal cp} $的行为 - 甚至是综合基金横截面以及几个关键差分分布的$ odd和-odd和 - 混合方案。此外，我们还表明，即使在综合信托横截面的水平上，NLO校正和外壳效应也起着重要作用，并且在差分分布中进一步增强了这些作用。即使我们在这里专注于标准模型Higgs玻色子，但可以将计算直接应用于具有扩展的Higgs-Boson扇区的模型，并预测$ {\ cal CP} $ - 奇数Higgs样粒子的存在，例如Twip-Higgs Doubleet模型。
Since its discovery at the Large Hadron Collider in 2012 the Higgs boson has arguably become the most famous of the Standard Model particles and many measurements have been performed in order to assess its properties. Among others, these include measurements of the Higgs boson's ${\cal CP}$ state which is predicted to be ${\cal CP}$-even. Even though a pure ${\cal CP}$-odd state has been ruled out, a possible admixture of a ${\cal CP}$-odd Higgs state has yet to be excluded. In this work we present predictions for the associated production of a leptonically decaying top quark pair and a stable Higgs boson $p p \to e^+ ν_e\, μ^- \barν_μ\,b\bar{b}\,H$ with possible mixing between ${\cal CP}$-even and ${\cal CP}$-odd states at NLO in QCD for the LHC with $\sqrt{s} = 13$ TeV. Finite top-quark and gauge boson width effects as well as all double-, single- and non-resonant Feynman diagrams including their interference effects are taken into account. We compare the behaviour of the ${\cal CP}$-even, -odd and -mixed scenarios for the integrated fiducial cross-sections as well as several key differential distributions. In addition, we show that both NLO corrections and off-shell effects play an important role even at the level of integrated fiducial cross-sections and that these are further enhanced in differential distributions. Even though we focus here on the Standard Model Higgs boson, the calculations could be straightforwardly applied to models that have an extended Higgs-boson sector and predict the existence of ${\cal CP}$-odd Higgs-like particles, such as the two-Higgs-doublet model.
