论文标题
在HL-LHC上测试额外的希格斯态的CP特性
Testing CP Properties of Extra Higgs States at the HL-LHC
论文作者
论文摘要
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情况下。如果在LHC或未来的山利区发现，将出现问题是在扩展标量领域是否违反或保存CP。 （间接）违反CP的明确探测是，观察到额外的希格斯颗粒之一是CP-E-E-E-E-E-E-ODD状态的混合。我们讨论了以这种方式在LHC的高光度（HL）阶段以这种方式发现标量CP的可能性。我们专注于I型I型双重双重模型，在其中研究其当前允许的参数区域。考虑到与当前约束兼容的基准点，但在HL-LHC的范围内，我们研究了通过衰减$ h \ h \ toτ\ bar v的最终状态的角度分布来确定额外中性higgs $ h $的CP属性的前景。该分析在重建级别上进行，利用增强的决策树，以进行有效的信号背景分离，并进行形状分析，以拒绝$ h $的纯CP或奇数。
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 $H$.
