在2HDM中利用$t\ar{t}$+Higgs($\ o b\ar{b}$)事件搜索额外Higgs玻色子：直接探测与间接探测
Searches for Extra Higgs Bosons using $t\bar{t}+$Higgs{$(\to b\bar b)$} Events within 2HDMs: Direct versus Indirect Probes
AI总结：
本文提出利用$t\ar{t}$+Higgs事件的动能特征，在2HDM中直接探测额外Higgs玻色子，通过比较不同方法验证其有效性。
摘要：
我们研究了在过程$gg,q\bar{q}→t\bar{t}Φ$中建立额外Higgs态产生可能性的可能性，其中$Φ$=$H_{2,3}$，$H_2$为CP偶极子，$H_3$为CP奇极子，在大型强子对撞机（LHC）上，仅利用重构$t\bar{t}$系统的动力学特征。我们采用一个通用的CP保持2Higgs双态模型（2HDM）作为参考理论框架，该模型也容纳了一个标准模型（SM）样的Higgs态$H_1$。我们表明，$m_{H_{2,3}}$的质量与$t\bar{t}$系统属性之间有明显的相关性，原则上可以从这些特征中提取出来。此外，$H_{2,3}$状态的CP性质可以确定，即使两个状态同时产生。然后，我们比较了使用此方法得到的结果与通过完全动力学重构$H_{2,3}$衰变在最研究的$b\bar{b}$通道（我们取$m_{H_{2,3}}<2m_t$）中得到的结果，从而证明了所提出方法的优越性。这为发现和表征与顶夸克-反顶夸克对 inclusively 关联产生的额外Higgs态铺平了道路，从而避免了从其衰变产物中进行exclusive重构的固有复杂性。我们通过在复合2HDM（C2HDM）中测试我们的方法来验证这一点，该模型将Higgs描述为伪Nambu Goldstone玻色子（pNGBs），并自然预测Higgs质量谱在描述分析的敏感范围内。
英文摘要：
We study the possibility of establishing the production of additional Higgs states in the process $gg,q\bar q\to t\bar t Φ$, where $Φ$ = $H_{2,3}$, with $H_2$ being CP-even and $H_3$ being CP-odd, at the Large Hadron Collider (LHC), by solely exploiting the kinematic features of the reconstructed $t\bar t$ system. We adopt as reference theoretical framework a generic CP-Conserving 2-Higgs Doublet Model (2HDM), which also accommodate a Standard Model (SM)-like Higgs state $H_1$. We show that the masses $m_{H_{2,3}}$ exhibit clear correlations with the $t\bar{t}$ system properties and could, in principle, be extracted from these. Moreover, the CP properties of the $H_{2,3}$ states can be determined, even when both states are produced simultaneously. We then compare the results produced using this method with those obtained from a full kinematic reconstruction of the $H_{2,3}$ decays in the most studied $b\bar b$ channel (we take $m_{H_{2,3}}< 2m_t$), thus proving the superiority of the approach here proposed. This paves the way to both the discovery and characterization of additional Higgs states produced {\sl inclusively} in association with top-antitop quark pairs, thereby dispensing of the complications intrinsic to the {\sl exclusive} reconstruction of such states from their decay products. We test this by establishing the sensitivity of our approach in the case of a Composite 2HDM (C2HDM), describing the Higges as pseudo-Nambu Goldstone Bosons (pNGBs) and naturally predicting Higgs mass spectra in the range of sensitivity of the described analysis.
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