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arXiv 2011.10388hep-ph
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在HL-LHC上测试额外Higgs态的CP性质

Testing CP Properties of Extra Higgs States at the HL-LHC

Stefan Antusch, Oliver Fischer, A. Hammad, Christiane Scherb

摘要:

额外的希格斯状态出现在当前基本粒子标准模型之外的各种场景中。如果在大型强子对撞机或未来的对撞机上发现,那么在扩展标量扇区中CP是否被破坏或守恒的问题就会出现。(间接)CP破坏的一个明确的探测是观察到一个额外的希格斯粒子是CP偶态和CP奇态的混合物。我们讨论的可能性,发现标量CP破坏,以这种方式在高亮度(HL)阶段的大型强子对撞机。我们专注于双希格斯偶模型的I型,在那里我们调查目前允许的参数区域。考虑到一个与当前约束相容但在HL-LHC范围内的基准点,我们研究了通过衰变终态的角分布确定额外中性Higgs态$H$的CP性质的前景$H \to τ\barτ$ .在重建的水平上进行分析,利用提升决策树进行有效的信号-背景分离和形状分析,用于拒绝$H$的纯CP-偶或奇性质。

英文摘要:

Extra Higgs states appear in various scenarios beyond the current Standard Model of elementary particles. If discovered at the LHC or future colliders, the question will arise whether CP is violated or conserved in the extended scalar sector. An unambiguous probe of (indirect) CP violation would be the observation that one of the extra Higgs particles is an admixture of a CP-even and a CP-odd state. We discuss the possibility to discover scalar CP violation in this way at the high-luminosity (HL) phase of the LHC. We focus on the Two-Higgs Doublet Model of type I, where we investigate its currently allowed parameter region. Considering a benchmark point that is compatible with the current constraints but within reach of the HL-LHC, we study the prospects of determining the CP property of an extra neutral Higgs state $H$ via the angular distribution of final states in the decay $H \to τ\barτ$. The analysis is performed at the reconstructed level, making use of a Boosted Decision Tree for efficient signal-background separation and a shape analysis for rejecting a purely CP-even or odd nature of $H$.

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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